%     \iffalse
%<*ID>
%%% ====================================================================
%%%  @LaTeX-package-file{
%%%     author          = "Heldoorn M.",
%%%     version         = "0.06 Final Release",
%%%     date            = "8 April 1999",
%%%     time            = "12:00:00 MET",
%%%     filename        = "SIunits.dtx",
%%%     address         = "Marcel Heldoorn
%%%                        Kennedylaan 24
%%%                        NL-3844 BC  HARDERWIJK
%%%                        The Netherlands",
%%%     telephone       = "++31 341 427983",
%%%     FAX             = "++31 71 5276782",
%%%     email           = "M.Heldoorn@physiology.medfac.leidenuniv.nl",
%%%     codetable       = "ISO/ASCII",
%%%     keywords        = "SI, unit, units, International System of Units,
%%%                        physical, physics",
%%%     supported       = "maybe",
%%%     abstract        = "This package defines commands for using
%%%                        standard SI units in all your texts. The
%%%                        package provides different options for the
%%%                        spacing of the units.",
%%%     copyright       = "Copyright (C) 1999 Marcel Heldoorn.
%%%
%%%                        This program can be redistributed and/or modified under the
%%%                        terms of the LaTeX Project Public License Distributed from
%%%                        CTAN archives in directory macros/latex/base/lppl.txt; either
%%%                        version 1 of the License, or (at your option) any later version.
%%%  }
%%% ====================================================================
%</ID>
%<*package>
\def\packagename{SIunits}
\def\packagemessage{}
\def\fileversion{0.06}
\def\filedate{1999/04/08}
\def\docdate{1999/04/08}
%</package>
%    \fi
% \CheckSum{1624}
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%     \iffalse
%<*config>
%% SIunits configuration file: SIunits.cfg
%%
%% You can uncomment one or more of the lines below to set default options.
%%
%%\ExecuteOptions{cdot}
%%\ExecuteOptions{thickspace}
%%\ExecuteOptions{mediumspace}
%%\ExecuteOptions{thinspace}
%%\ExecuteOptions{thickqspace}
%%\ExecuteOptions{mediumqspace}
%%\ExecuteOptions{thinqspace}
%%\ExecuteOptions{amssymb}
%%\ExecuteOptions{squaren}
%</config>
%<*batchfile>
%
%
% (1) run SIunits.ins through TeX to get the package
% (you get: SIunits.sty, SIunits.cfg)
%
% (2) run SIunits.drv through TeX (LaTeX) to get the documentation
% (you get: SIunits.dvi)
%
% [or use DOCSTRIP and extract SIunits.sty from SIunits.dtx
% using option `package']
%
%
\begin{filecontents}{SIunits.ins}
%%
%% SIunits.ins will generate the fast loadable file SIunits.sty and
%% the configuration file SIunits.cfg from the package file SIunits.dtx
%% when run through LaTeX or TeX.
%%
%% Copyright (C) 1999  Marcel Heldoorn
%%
%% This file may be distributed under the terms of the LaTeX Project Public
%% License, as described in lppl.txt from CTAN archives in directory
%% macros/latex/base/lppl.txt; either version 1 of the License, or (at your
%% option) any later version.
%%
%% NOTE:
%% The LPPL about .ins files:
%%    - Files with extension `.ins' (installation files): these files may
%%      not be modified at all because they contain the legal notices
%%      that are placed in the generated files.
%%
%% --------------- start of docstrip commands ------------------
%%
\def\batchfile{SIunits.ins}
\input docstrip.tex
\keepsilent \preamble

Copyright (c) 1999 Marcel Heldoorn <m.heldoorn@physiology.medfac.leidenuniv.nl>.

This program can be redistributed and/or modified under the terms of the
LaTeX Project Public License Distributed from CTAN archives in directory
macros/latex/base/lppl.txt; either version 1 of the License, or (at your
option) any later version.

For error reports in case of UNCHANGED versions see the readme.txt file.

Please do not request updates from me directly. Distribution is done through the
Comprehensive TeX Archive Network (CTAN).

\endpreamble
\generate{\file{SIunits.sty}{\from{SIunits.dtx}{package}}}
\nopreamble
\generate{\file{SIunits.cfg}{\from{SIunits.dtx}{config}}}
 \Msg{************************************************************}
 \Msg{ }
 \Msg{ To finish the installation you have to move the file}
 \Msg{ `SIunits.sty' (and optionally the file `SIunits.cfg')}
 \Msg{ into a directory searched by LaTeX.}
 \Msg{}
 \Msg{ To type-set the documentation, run the file `SIunits.dtx'}
 \Msg{ through LaTeX.}
 \Msg{ }
 \Msg{ Happy LaTeXing}
 \Msg{ }
 \Msg{************************************************************}
\endbatchfile
\end{filecontents}
%</batchfile>
%<*driver>
%
\let\opt\textsf %    mode/option names are typeset this way

\documentclass[a4paper]{ltxdoc}
%%%\documentclass[a4paper]{article}
%%%\usepackage{doc,shortvrb}
%%%\MakeShortVerb{\|}
 \setlength\hfuzz{1000pt}
 \setlength\overfullrule{1000pt}

\IfFileExists{SIunits.sty}{\usepackage[derivedinbase,derived]{SIunits}
 \let\SIunitsSTYfound\active}{\GenericWarning{SIunits.DTX}{Package
 file SIunits.STY not found (Documentation will be messed up!^^J^^A
 Generate SIunits.STY by (La)TeXing SIunits.INS, process SIunits.DTX again)^^J}}

\newenvironment{labeling}[1]
 {\list{}{\settowidth{\labelwidth}{\textbf{#1}}
 \leftmargin\labelwidth\advance\leftmargin\labelsep
 \def\makelabel##1{\textbf{##1}\hfil}}}{\endlist}
\newcommand{\note}[1]{\(^{\mathbf{(#1)}}\)}
\newcounter{tabel}\addtocounter{tabel}{1}
\newcommand{\Fe}{\textit{For example:\ }}
\newcommand{\fe}{\textit{for example:\ }}
\addunit{\bit}{bit}

 \begin{document}
 \typeout
   {*************************************
 ^^J*    Expect some Underfull boxes.   *
 ^^J*************************************}
 \DocInput{SIunits.dtx}
 \end{document}
%</driver>
%    \fi
%    \newcommand\ttSIunits{\texttt{SIunits}}
%
%    \title{The \ttSIunits\ package\thanks{This file has version number \fileversion, last revised \filedate,
%    documentation dated \docdate. \packagemessage}\\{\large support for the \textsf{International System of Units} }
%    }
%    \author{Marcel Heldoorn\thanks{Mail: Kennedylaan 24, NL-3844~BC Harderwijk, The~Netherlands}\\ \texttt{m.heldoorn@physiology.medfac.leidenuniv.nl}}
%    \date{File date \filedate\ ---  Printed \today}
%
%    \changes{v0.06 Beta  2}{1998/04/07}{Problem with amssymb package solved thanks to Timothy C. Burt}
%    \changes{v0.05 Final Release}{1999/03/30}{Release v0.05 under LaTeX Project Public License}
%    \changes{v0.05 Beta 2}{1999/03/30}{First package release under LaTeX Project Public License}
%    \changes{v0.03 Final Release}{1999/01/15}{Release v0.03}
%    \changes{v0.03 Beta  6}{1998/12/15}{Stable version, before releasing v0.03}
%    \changes{v0.03 Beta  5}{1998/12/11}{Support for configuration file added, stable}
%    \changes{v0.03 Beta  4}{1998/12/10}{Stable version, before adding configuration file parameters}
%    \changes{v0.02 Beta  5}{1998/09/23}{Generated for Timothy C. Burt (tcburt@comp.uark.edu)}
%    \changes{v0.02 Beta  4}{1998/09/15}{Typos corrected (thanks to Rafael Rodriguez Pappalardo)}
%    \changes{v0.02 Beta  3}{1998/09/11}{Code documentation checked and corrected}
%    \changes{v0.01}{1998/09/07}{Small documentation errors (thanks to Juergen von Haegen)}
%    \changes{v0.00 Beta 4}{1998/08/14}{Inconsistencies removed/changed}
%    \changes{v0.00 Beta 3}{1998/08/11}{Options implemented; better documentation}
%    \changes{v0.00 Beta 2}{1998/07/30}{Various small Improvements}
%    \changes{v0.00 Beta 1}{1998/07/24}{Initial working version}
%
%    \maketitle
%
%   \begin{abstract}
%   \noindent This article describes the \ttSIunits\ package that provides support for the
%   \textsf{Syst\`{e}me International d'Unit\'{e}s} (SI).
%
%   The Syst\`{e}me International d'Unit\'{e}s (SI), the modern form of the metric system, is the most
%   widely used system of units and measures around the world. But despite this there is
%   widespread misuse of the system with incorrect names and symbols used as a matter a course -
%   even by well educated and trained people who should know better. For example how often do we
%   see: \milli\hertz, \mega hz or \milli hz written when referring to computer clock rates? The
%   correct form is actually \mega\hertz. Note that the capitalisation does matter.
%
%   Hence, a clear system for the use of units is needed, satisfying the next principles:
%   \begin{enumerate}
%   \item the system should consist of measuring units based on unvariable quantities in nature;
%   \item all units other than the base units should be derived from these base units; and
%   \item multiples and submultiples of the units should be decimal.
%   \end{enumerate}
%   The name Syst\`{e}me International d'Unit\'{e}s (International System of Units) with the
%   international abbreviation SI was adopted by the Conf\'{e}rence G\'{e}n\'{e}rale des Poids et Mesures
%   (CGPM) in 1960. It is a coherent system based on seven base units (CGPM 1960 and 1971).
%   \\ \\ The \ttSIunits\ package can be used to standardise the use of units in your writings. Most
%   macros are easily adaptable to personal preferences. However, you are welcome (and strongly
%   invited\footnote{There is an enormous \LaTeX\ Knowledge Base out there.}) to suggest any
%   improvements. \\ \\ {\itshape Enjoy the \ttSIunits\ package!\raisebox{-\baselineskip}[0pt][0pt]{marcel h.}}
%   \end{abstract}
%   \newpage \tableofcontents\newpage
%   \section{Introduction}
%
%   \subsection{Historical notes}
%   In 1948 the 9th General Conference on Weights and Measures (CGPM\footnote{See section
%   \ref{acronyms} for acronyms}), by its Resolution 6, instructed the International Committee
%   for Weights and Measures (CIPM\footnotemark[\value{footnote}]):
%   \begin{verse}
%   `to study the establishment of a complete set of rules for units of measurement';
%
%   `to find out for this purpose, by official inquiry, the opinion prevailing in scientific,
%   technical, and educational circles in all countries'; and
%
%   `to make recommendations on the establishment of a \textit{practical system of units of
%   measurement} suitable for adoption by all signatories to the Meter Convention.'
%   \end{verse}
%
%   The same General Conference also laid down, by its Resolution 7, general principles for unit
%   symbols and also gave a list of units with special names. \\
%
%   The 10th CGPM (1954), by its Resolution 6, and the 14th CGPM (1971), by its Resolution 3,
%   adopted as base units of this `practical system of units,' the units of the following seven
%   quantities: length, mass, time, electric current, thermodynamic temperature, amount of
%   substance, and luminous intensity.\\
%
%   The 11th CGPM (1960), by its Resolution 12, adopted the name \textit{Syst\`{e}me International
%   d'Unit\'{e}s (International System of Units)}, with the international abbreviation \textit{SI}, for this
%   practical system of units of measurement, and laid down rules for the prefixes, the derived
%   and supplementary units, and other matters, thus establishing a comprehensive specification
%   for units of measurement.
%
%   \subsection{The three classes of SI units}
%   SI units are divided into three classes: {\it base} units, {\it derived} units and {\it
%   supplementary} units. The General Conference decided to base the International System on a
%   choice of seven well-defined units which by convention are regarded as dimensionally
%   independent: the metre, the kilogram, the second, the ampere, the kelvin, the mole, and the
%   candela. These units are called \textit{base units}.\\
%
%   The second class of SI units contain \textit{derived units}, i.\,e., units that can be
%   formed by combining base units according to the algebraic relations linking the
%   corresponding quantities. The names and symbols of some units thus formed in terms of base
%   units can be replaced by special names and symbols which can themselves be used to form
%   expressions and symbols of other derived units (see section \ref{derived}, p.
%   \pageref{derived}).\\
%
%   The 11th CGPM (1960) admitted a third class of SI units, called \textit{supplementary units}
%   and containing the SI units of plane and solid angle.\\
%
%   The 20th CGPM (1995) decided to eliminate the class of supplementary units as a separate
%   class in the SI. Thus the SI now consists of only two classes of units: base units and
%   derived units, with the radian and the steradian, which are the two supplementary units,
%   subsumed into the class of derived SI units.\\
%
%   \subsection{The SI prefixes}
%   The General Conference has adopted a series of prefixes to be used in forming the decimal
%   multiples and submultiples of SI units. Following CIPM Recommendation 1 (1969), the set of
%   prefixes is designated by the name \textit{SI prefixes}.
%
%   The multiples and submultiples of SI units, which are formed by using the SI prefixes,
%   should be designated by their complete name, \textit{multiples and submultiples of SI
%   units}, in order to make a distinction between them and the coherent set of SI units proper
%
%   \subsection{Acronyms}
%   \label{acronyms} The SI was established in 1960 by the CGPM. The CGPM is an
%   intergovernmental treaty organisation created by a diplomatic treaty called the Meter
%   Convention (Convention du M\`{e}tre, often called the Treaty of the Meter in the United States).
%   The Meter Convention was signed in Paris in 1875 by representatives of seventeen nations,
%   including the United States. There are now forty-eight Member States, including all the
%   major industrialised countries. The Convention, modified slightly in 1921, remains the basis
%   of all international agreement on units of measurement.
%
%   The Meter Convention also created the International Bureau of Weights and Measures (BIPM,
%   Bureau International des Poids et Mesures) and the International Committee for Weights and
%   Measures (CIPM, Comit\'{e} International des Poids et Mesures). The BIPM, which is located in
%   S\`{e}vres, a suburb of Paris, France, and which has the task of ensuring worldwide unification
%   of physical measurements, operates under the exclusive supervision of the CIPM, which itself
%   comes under the authority of the CGPM.
%
%
%
%   \begin{description}
%   \item[CGPM] General Conference on Weights and Measures (\textit{Conf\'{e}rence G\'{e}n\'{e}rale des Poids
%   et Mesures}). The CGPM is the primary intergovernmental treaty organisation responsible for
%   the SI, representing nearly 50 countries. It has the responsibility of ensuring that the SI
%   is widely disseminated and modifying it as necessary so that it reflects the latest advances
%   in science and technology.
%
%   \item[CIPM] International Committee for Weights and Measures (\textit{Comit\'{e} International des
%   Poids et Mesures}). The CIPM comes under the authority of the CGPM. It suggests modifications
%   to the SI to the CGPM for formal adoption. The CIPM may also on its own authority pass
%   clarifying resolutions and recommendations regarding the SI.
%
%   \item[BIPM] International Bureau of Weights and Measures (\textit{Bureau International des
%   Poids et Mesures}). The BIPM, located outside Paris, has the task of ensuring worldwide
%   unification of physical measurements. It is the "international" metrology institute, and
%   operates under the exclusive supervision of the CIPM.
%   \end{description}
%
%   \subsection{Some useful definitions}
%   \begin{description}
%   \item [quantity in the general sense] A quantity in the general sense is a property ascribed to phenomena, bodies, or
%   substances that can be quantified for, or assigned to, a particular phenomenon, body, or
%   substance. Examples are mass and electric charge.
%   \item [quantity in the particular sense] A quantity in the particular sense is a quantifiable or assignable property ascribed
%   to a particular phenomenon, body, or substance. Examples are the mass of the moon and the
%   electric charge of the proton.
%   \item [physical quantity] A physical quantity is a quantity that can be used in the mathematical equations of
%   science and technology.
%   \item [unit] A unit is a particular physical quantity, defined and adopted by convention, with
%   which other particular quantities of the same kind are compared to express their value.
%   \end{description}\par \noindent
%   The {\bf value of a physical quantity} is the quantitative expression of a particular
%   physical quantity as the product of a number and a unit, the number being its numerical
%   value. Thus, the numerical value of a particular physical quantity depends on the unit in
%   which it is expressed.\\ \\ More formally, the value of quantity \(A\) can be written as
%   \(A=\lbrace A\rbrace [A]\), where \(\{A\}\) is the numerical value of \(A\) when \(A\) is
%   expressed in the unit \([A]\). The numerical value can therefore be written as \(\lbrace
%   A\rbrace=A/[A]\), which is a convenient form for use in figures and tables. Thus to
%   eliminate the possibility of misunderstanding, an axis of a graph or the heading of a column
%   of a table can be labelled `\(t\)\per\celsius' instead of `\(t\)(\celsius)' or `Temperature
%   (\celsius)'. Similarly, another example: `\(E/\)(\voltpermetre)' instead of
%   `\(E\)(\voltpermetre)' or `Electric field strength (\voltpermetre)'.\\ \\ \Fe the
%   value of the height $h_{W}$ of the Washington Monument is \(h_{W} = \unit {169} {\metre} = 555\;\)ft. Here
%   $h_{W}$ is the physical quantity, its value expressed in the unit metre, unit symbol \metre, is
%   \unit{169} {\metre}, and its numerical value when expressed in metres is \(169\).
%
%   \section{SI units}
%   \subsection{SI base units}
%   \subsubsection{Definitions}
%   The SI is founded on seven SI base units for seven base quantities assumed to be mutually
%   independent. The primary definitions of the SI base units are in French. Their current
%   definitions, along with an English translation, are given below:
%   \paragraph*{metre; {\it m\`{e}tre}}
%   \begin{description}
%   \item[] {\it Le m\`{e}tre est la longueur du trajet parcouru dans le vide par la lumi\`{e}re pendant
%   une dur\'{e}e de \(1/299\;792\;458\) de seconde.}\\ {(17th CGPM (1983), Resolution 1).} \item[] {The
%   metre is the length of the path travelled by light in vacuum during a time interval of \(1/299\;792\;458\) of a second.}
%   \end{description}
%   \paragraph*{kilogram; {\it kilogramme}}
%   \begin{description}
%   \item[]{\it Le kilogramme est l'unit\'{e} de masse; il est \'{e}gal \`{a} la masse du prototype
%   international du kilogramme.}\\ (1st CGPM (1889) and 3rd CGPM (1901)). \item[]{The kilogram
%   is the unit of mass; it is equal to the mass of the international prototype of the
%   kilogram.} \\{{\it Note}: This international prototype is made of platinum-iridium and is
%   kept at the International Bureau of Weights and Measures, S\`{e}vres, France.}
%   \end{description}
%   \paragraph*{second; {\it seconde}}
%   \begin{description}
%   \item[]{\it La seconde est la dur\'{e}e de \(9\;192\;631\;770\) p\'{e}riodes de la radiation correspondant
%   \`{a} la transition entre les deux niveaux hyperfins de l'\'{e}tat fondamental de l'atome de cesium
%   133.} \\(13th CGPM (1967), Resolution 1). \item[]{The second is the duration of \(9\;192\;631\;770\)
%   periods of the radiation corresponding to the transition between the two hyperfine
%   levels of the ground state of the cesium-\(133\) atom.}
%   \end{description}
%   \paragraph*{ampere; {\it amp\`{e}re}}
%   \begin{description}
%   \item[]{\it L'amp\`{e}re est l'intensit\'{e} d'un courant constant qui, maintenu dans deux
%   conducteurs parall\`{e}les, rectilignes, de longueur infinie, de section circulaire n\'{e}gligeable,
%   et plac\'{e}s \`{a} une distance de 1 m\`{e}tre l'un de l'autre dans le vide, produirait entre ces
%   conducteurs une force \'{e}gale \`{a} \(2{\times}10^{-7}\) newton par m\`{e}tre de longueur.}\\ (9th CGPM (1948),
%   Resolutions 2 and 7). \item[]{The ampere is that constant current which, if maintained in
%   two straight parallel conductors of infinite length, of negligible circular cross-section,
%   and placed 1 metre apart in vacuum, would produce between these conductors a force equal to
%   \(2{\times}10^{-7}\) newton per metre of length.}
%   \end{description}
%   \paragraph*{kelvin; {\it kelvin}}
%   \begin{description}
%   \item[]{\it Le kelvin, unit\'{e} de temp\'{e}rature thermodynamique, est la fraction \(1/273,16\) de la
%   temp\'{e}rature thermodynamique du point triple de l'eau.}\\(13th CGPM (1967), Resolution 4).
%   \item[]{The kelvin, unit of thermodynamic temperature, is the fraction \(1/273.16\) of the
%   thermodynamic temperature of the triple point of water. \\The 13th CGPM (1967, Resolution 3)
%   also decided that the unit kelvin and its symbol \kelvin\ should be used to express both
%   thermodynamic temperature and an interval or a difference of temperature, instead of `degree
%   Kelvin' with symbol \degree\kelvin.\\ \\ In addition to the thermodynamic temperature
%   (symbol \(T\)) there is also the Celsius (symbol \(t\)) defined by the equation
%   \(t= T-T_{0}\) where \(T_{0}=\) \unit{273.15} {\kelvin}. Celsius temperature is expressed in
%   degree Celsius; {\it degr\'{e} Celsius} (symbol \degreecelsius). The unit `degree Celsius' is equal to
%   the unit `kelvin'; in this case, `degree Celsius' is a special name used in place of
%   `kelvin'. A temperature interval or difference of Celsius temperature can, however, be
%   expressed in kelvins as well as in degrees Celsius.}
%   \end{description}
%   \paragraph*{mole; {\it mole}}
%   \begin{description}
%   \item[]{\it 1°. La mole est la quantit\'{e} de mati\`{e}re d'un syst\`{e}me contenant autant d'entit\'{e}s
%   \'{e}l\'{e}mentaires qu'il y a d'atomes dans \(0,012\) kilogramme de carbone \(12\). } \item[]{\it 2°.
%   Lorsqu'on emploie la mole, les entit\'{e}s \'{e}l\'{e}mentaires doivent \^{e}tre sp\'{e}cifi\'{e}es et peuvent \^{e}tre
%   des atomes, des mol\'{e}cules, des ions, des \'{e}lectrons, d'autres particules ou des groupements
%   sp\'{e}cifi\'{e}s de telles particules.}\\ (14th CGPM (1971), Resolution 3). \item[]{1. The mole is
%   the amount of substance of a system which contains as many elementary entities as there are
%   atoms in \(0.012\) kilogram of carbon \(12\).} \item[]{2. When the mole is used, the elementary
%   entities must be specified and may be atoms, molecules, ions, electrons, other particles or
%   specified groups of such particle.\\{\it Note}: In this definition, it is understood that
%   the carbon 12 atoms are unbound, at rest and in their ground state.}
%   \end{description}
%   \paragraph*{candela; {\it candela}}
%   \begin{description}
%   \item[]{\it La candela est l'intensit\'{e} lumineuse, dans une direction donn\'{e}e, d'une source
%   qui \'{e}met une radiation monochromatique de fr\'{e}quence \(540{\times}\power{10}{12}\) hertz et dont l'intensit\'{e}
%   \'{e}nerg\'{e}tique dans cette direction est \(1/683\) watt par st\'{e}radian.}\\ (16th CGPM (1979),
%   Resolution 3). \item[]{The candela is the luminous intensity, in a given direction, of a
%   source that emits monochromatic radiation of a frequency \(540{\times}\power{10}{12}\) hertz and has
%   a radiant intensity in that direction of \(1/683\) watt per steradian.}
%   \end{description}
%   \subsubsection{Symbols}
%   The base units of the International System are collected in table \arabic{tabel} with their
%   names and their symbols (10th CGPM (1954), Resolution 6; 11th CGPM (1960), Resolution 12;
%   13th CGPM (1967), Resolution 3; 14th CGPM (1971), Resolution 3).\\
%   \begin{tabbing} \label{tabel:base}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxxxxxxx}\hspace{0.5cm} \=
%   \textbf{xxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+ \\ \textbf{Quantity} \>
%   \textbf{Name}\> \textbf{Symbol}\\ \\ length \> metre \> \metre \\ mass \> kilogram \>
%   \kilogram \\ time \> second \> \second \\ electric current \> ampere \> \ampere \\
%   thermodynamic temperature \> kelvin \> \kelvin \\ amount of substance \> mole \> \mole \\
%   luminous intensity \> candela \> \candela \\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- SI base unit ---\\ \addtocounter{tabel}{1}
%   \rule{\textwidth}{1pt}
%
%   \subsection{SI derived units}\label{derived}
%   \enlargethispage{\baselineskip}
%   SI derived units are expressed algebraically in terms of base units by means of the
%   mathematical symbols of multiplication and division (see table \arabic{tabel} for some
%   examples).\\
%   \begin{tabbing}\label{tabel:derived1}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxxxxxx}\hspace{0.5cm}
%   \= \textbf{xxxxxxxxxxxxxx} \+ \kill \\ \textbf{Derived quantity} \> \textbf{Name} \>
%   \textbf{Symbol}\\ \\
%    area                               \>  square metre                \>   \squaremetre   \\
%    volume                             \>  cubic metre                 \>   \cubicmetre     \\
%    speed, velocity                    \>  metre per second            \>   \metrepersecond\\
%    acceleration                       \>  metre per second squared    \>   \metrepersquaresecond  \\
%    wave number                        \>  reciprocal metre            \>   \reciprocal\metre   \\
%    mass density                       \>  kilogram per cubic metre    \>   \kilogrampercubicmetre     \\
%    specific volume                    \>  cubic metre per kilogram    \>   \cubicmetreperkilogram     \\
%    current density                    \>  ampere per square metre     \>   \amperepersquaremetre      \\
%    magnetic field\\ ~strength          \>  ampere per metre            \>   \amperepermetre       \\
%    amount-of-substance\\ ~concentration\>  mole per cubic metre        \>   \mole\per\cubicmetre    \\
%    luminance                          \>  candela per square metre    \>   \candelapersquaremetre     \\
%    mass fraction                      \>  kilogram per kilogram       \>   \kilogram\per\kilogram\(\,=1\)\note{a} \-\\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- Examples of SI derived units ---\\ \note{a}the symbol 1
%   for quantities of dimension 1 such as mass fraction is generally omitted.\\
%   \addtocounter{tabel}{1} \rule{\textwidth}{1pt}
%
%   \subsubsection{SI derived units with special names and symbols}For ease of understanding and
%   convenience, 21 SI derived units have been given special names and symbols, as shown in
%   Table \arabic{tabel}. They may themselves be used to express other derived units. \\
%   \begin{tabbing}\label{tabel:derived2}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxx}\hspace{0.5cm} \= \textbf{xxxxxxxxxx}\hspace{1cm} \=
%   \textbf{xxxxx}\hspace{1cm} \= \textbf{xxxxxxxxx}\kill \+\\ \textbf{Name} \>
%   \textbf{Expression in} \> \textbf{Symbol} \> \textbf{Expression in} \\
%    \>  \textbf{SI base units}  \>  \> \textbf{SI derived units}  \\
%    radian\note{a}  \>  \radianbase\(\,=1\)\note{b}  \>  \radian  \>  \derradian  \\
%    steradian\note{a}  \>  \steradianbase \(\,=1\)\note{b} \>  \steradian\note{c}  \>  \dersteradian  \\
%    hertz  \>  \hertzbase  \>  \hertz  \>  \derhertz  \\
%    newton  \>  \newtonbase  \>  \newton  \>  \dernewton  \\
%    pascal  \>  \pascalbase  \>  \pascal  \>  \derpascal  \\
%    joule  \>  \joulebase  \>  \joule  \>  \derjoule  \\
%    watt  \>  \wattbase  \>  \watt  \>  \derwatt  \\
%    coulomb  \>  \coulombbase  \>  \coulomb  \>  \dercoulomb  \\
%    volt  \>  \voltbase  \>  \volt  \>  \dervolt  \\
%    farad  \>  \faradbase  \>  \farad  \>  \derfarad \\
%    ohm  \>  \ohmbase  \>  \ohm  \>  \derohm  \\
%    siemens  \>  \siemensbase  \>  \siemens  \>  \dersiemens  \\
%    weber  \>  \weberbase  \>  \weber  \>  \derweber  \\
%    tesla  \>  \teslabase  \>  \tesla  \>  \dertesla  \\
%    henry  \>  \henrybase  \>  \henry  \>  \derhenry  \\
%    celsius  \>  \celsiusbase  \>  \celsius  \>  \dercelsius  \\
%    lumen  \>  \lumenbase\note{c}  \>  \lumen  \>  \derlumen  \\
%    lux  \>  \luxbase  \>  \lux  \>  \derlux  \\
%    becquerel  \>  \becquerelbase  \>  \becquerel  \>  \derbecquerel  \\
%    gray  \>  \graybase  \>  \gray  \>  \dergray  \\
%    sievert\note{d} \>  \sievertbase  \>  \sievert  \>  \dersievert  \\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- \addtocounter{tabel}{1}SI derived units with special names and symbols
%   ---\\ \note{a}The radian and steradian may be used advantageously in expressions for derived units to distinguish between quantities of a different nature
%   but of the same dimension; some examples are given in Table \arabic{tabel}.\\ \note{b}In practice, the
%   symbols \radian\ and \steradian\ are used where appropriate, but the derived unit `\(1\)' is
%   generally omitted.\\ \note{c}In photometry, the unit name steradian and the unit symbol \steradian\
%   are usually retained in expressions for derived units.\\ \note{d}Other
%   quantities expressed in sieverts are ambient dose equivalent, directional dose equivalent,
%   personal dose equivalent, and organ equivalent dose.
%   \rule{\textwidth}{1pt}
%   \subsubsection{Use of SI derived units with special names and symbols}
%   Examples of SI derived units that can be expressed with the aid of SI derived units having
%   special names and symbols (including the radian and steradian) are given in Table
%   \arabic{tabel}. The advantages of using the special names and symbols of SI derived units
%   are apparent in Table \arabic{tabel}. Consider, for example, the quantity molar entropy: the
%   unit \joule\per\mole\usk\kelvin\ is obviously more easily understood than its SI base-unit
%   equivalent,
%   \squaremetre\usk\kilogram\usk\second\rpsquared\usk\reciprocal\kelvin\reciprocal\mole.
%   Nevertheless, it should always be recognised that the special names and symbols exist for
%   convenience. \addtocounter{tabel}{-2} Tables \arabic{tabel}\addtocounter{tabel}{1} and
%   \arabic{tabel}\addtocounter{tabel}{1} also show that the values of
%   several different quantities are expressed in the same SI unit. For example, the joule per
%   kelvin (\joule\per\kelvin) is the SI unit for heat capacity as well as for entropy. Thus the
%   name of the unit is not sufficient to define the quantity measured. A derived unit can often
%   be expressed in several different ways through the use of base units and derived units with
%   special names. In practice, with certain quantities, preference is given to using certain
%   units with special names, or combinations of units, to facilitate the distinction between
%   quantities whose values have identical expressions in terms of SI base units. For example,
%   the SI unit of frequency is specified as the hertz (Hz) rather than the reciprocal second
%   (\reciprocal\second), and the SI unit of moment of force is specified as the newton metre
%   (\newtonmetre) rather than the joule (\joule).
%
%   \begin{tabbing}\label{tabel:derived3}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxxxxxx}\hspace{0.5cm}
%   \= \textbf{xxxxxxxxxxxxxx} \+ \kill \\ \textbf{Derived quantity} \> \textbf{Name} \>
%   \textbf{Symbol}\\ \\
%    angular velocity    \> radian per second \>    \radianpersecond \\
%    angular acceleration \> radian per second squared \> \radianpersquaresecond  \\
%    dynamic viscosity \> pascal second \> \pascalsecond \\
%    moment of force  \> newton metre \> \newtonmetre \\
%    surface tension \>  newton per metre \> \newtonpermetre \\
%    heat flux density,\\ irradiance \> watt per square metre \> \wattpersquaremetre \\
%    radiant intensity \> watt per steradian \> \watt\per\steradian \\
%    radiance \> watt per square metre steradian \> \wattpersquaremetresteradian  \\
%    heat capacity,\\ entropy \> joule per kelvin \> \jouleperkelvin \\
%    specific heat capacity,\\  specific entropy \> joule per kilogram kelvin \> \jouleperkilogramkelvin \\
%    specific energy  \> joule per kilogram \> \jouleperkilogram  \\
%    thermal conductivity \> watt per metre kelvin \> \wattpermetrekelvin \\
%    energy density \> joule per cubic metre \> \joulepercubicmetre \\
%    electric field strength \> volt per metre \> \voltpermetre \\
%   electric charge density \> coulomb per cubic metre \> \coulombpercubicmetre \\
%   electric flux density \> coulomb per square metre \> \coulombpersquaremetre \\
%   permittivity \> farad per metre \> \faradpermetre \\
%   permeability \> henry per metre \> \henrypermetre \\
%   molar energy \> joule per mole  \> \joulepermole \\
%   molar entropy, molar\\ heat capacity \> joule per mole kelvin \>  \joulepermolekelvin \\
%   exposure (x and \(\gamma\) rays)\> coulomb per kilogram \> \coulombperkilogram \\
%   absorbed dose rate \>  gray per second \>  \graypersecond \-\\
%    \end{tabbing}
%    \textsc{Table \arabic{tabel}} --- Examples of SI derived units expressed with the aid of SI
%    derived units having special names and symbols\\ \addtocounter{tabel}{1} \rule{\textwidth}{1pt}
%
%
%   \subsection{Rules and style conventions for writing and using SI unit symbols}
%   The general principles concerning writing the unit symbols were adopted by the 9th CPGM
%   (1948), by its Resolution 7:
%   \begin{enumerate}
%   \item Roman (upright) type, in general lower case\footnote{The recommended symbol for the
%   litre (`liter') in the United States is \liter.}, is used for the unit symbols. If,
%   however, the name of the unit is derived from a proper name, the first letter of the symbol
%   is in upper case.
%    \item Unit symbols are unaltered in the plural.
%    \item Unit symbols are not followed by a period\footnote{Unless at the end of a sentence.}.
%   \end{enumerate}
%   To ensure uniformity in the use of the SI unit symbols, ISO International Standards give
%   certain recommendations. Following these recommendations:
%   \begin{list}{a)}{}
%   \item The product of two or more units are indicated by means of either a half-high (that
%   is, centred) dot or a space\footnote{ISO suggests that if a space is used to indicate units
%   formed by multiplication, the space may be omitted if it does not cause confusion. This
%   possibility is reflected in the common practice of using the symbol \kilo\watt\hour\ rather
%   than \kilo\watt\(\cdot\)\hour\ or \kilo\watt\usk\hour\ for the kilowatt hour.}. The
%   half-high dot is preferred, because it is less likely to lead to confusion,
%    \begin{list}{}{}
%    \item \fe
%    \item \newton\(\cdot\)\metre\ or \(\newton\;\metre\).
%    \end{list}
%   \end{list}
%   \begin{list}{b)}{}
%    \item A solidus (oblique stroke,/), a horizontal line, or negative exponents may be used to
%   express a derived unit formed from two others by division,
%    \begin{list}{}{}
%    \item \fe
%    \item \metre\per\second,\ \(\frac{\metre}{\second}\),\ or  \metre\usk\reciprocal\second
%    \end{list}
%   \end{list}
%   \begin{list}{c)}{}
%    \item The solidus must not be repeated on the same line unless ambiguity is avoided by
%    parentheses. In complicated cases negative exponents or parentheses should be used,
%    \begin{list}{}{}
%    \item \fe
%    \item \metre\per\second\squared\ or\ \metre\usk\second\rpsquared\ \textit{but not:\ }\metre\per\second\per\second\
%    \item \metre\usk\kilogram\per(\cubic\second\usk\ampere)\ or
%    \metre\usk\kilogram\usk\rpcubic\second\usk\reciprocal\ampere\ \textit{but not:\ }\metre\usk\kilogram\per\cubic\second\per\ampere
%    \end{list}
%   \end{list}
%   \section{SI Prefixes}
%   \subsection{Decimal multiples and submultiples of SI units}
%   The 11th CGPM (1960), by its Resolution 12, adopted a first series of prefixes and symbols
%   of prefixes to form the names and symbols of the decimal multiples and submultiples of SI
%   units. Prefixes for \power {10}{-15} and \power {10}{-18} were added by the 12th CGPM
%   (1964), by its Resolution 8, those for \power {10}{15} and \power {10}{18} by the CGPM
%   (1975), by its Resolution 10, and those for \power {10}{21}, \power {10}{24}, \power {10}
%   {-21}, and \power {10}{-24} were proposed by the CIPM for approval by the 19th CGPM (1991),
%   and adopted.\\
%   \begin{tabbing}\label{tabel:prefixes}
%   \hspace{0.5cm}\=\textbf{xxxxx}\hspace{0.5cm} \= \textbf{xxxxx}\hspace{1cm} \=
%   \textbf{xxxxx}\kill \+\\ \textbf{Prefix}\> \textbf{Symbol}\> \textbf{Factor} \\
%    yocto  \>  \yocto  \>  \yoctod = \power{(\kilod)}{-8}\\
%    zepto  \>  \zepto  \>  \zeptod = \power{(\kilod)}{-7}\\
%    atto  \>  \atto  \>  \attod = \power{(\kilod)}{-6}\\
%    femto  \>  \femto  \>  \femtod = \power{(\kilod)}{-5}\\
%    pico  \>  \pico  \>  \picod = \power{(\kilod)}{-4}\\
%    nano  \>  \nano  \>  \nanod = \power{(\kilod)}{-3}\\
%    micro  \>  \micro  \>  \microd = \power{(\kilod)}{-2}\\
%    milli  \>  \milli  \>  \millid = \power{(\kilod)}{-1}\\
%    centi  \>  \centi  \>  \centid\\
%    deci  \>  \deci  \>  \decid \\
%    deca\note{a}  \>  \deca  \>  \decad \\
%    hecto  \>  \hecto  \>  \hectod \\
%    kilo  \>  \kilo  \>  \kilod = \power{(\kilod)}{1}\\
%    mega  \>  \mega  \>  \megad = \power{(\kilod)}{2}\\
%    giga  \>  \giga  \>  \gigad = \power{(\kilod)}{3}\\
%    tera  \>  \tera  \>  \terad = \power{(\kilod)}{4}\\
%    peta  \>  \peta  \>  \petad = \power{(\kilod)}{5}\\
%    exa   \>  \exa   \>  \exad = \power{(\kilod)}{6}\\
%    zetta  \>  \zetta  \>  \zettad = \power{(\kilod)}{7}\\
%    yotta  \>  \yotta  \>  \yottad = \power{(\kilod)}{8}\\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- SI prefixes ---\\ \note{a}In the USA, the spelling `deka'
%   is extensively used.\\ \addtocounter{tabel}{1} \rule{\textwidth}{1pt}
%   \subsection{Rules for using SI prefixes}
%   In accord with the general principles adopted by the ISO\footnote{ISO 31, in `Units of
%   measurement,' ISO Standards Handbook 2, 2nd Edition, ISO, Geneva, 1982, pp. 17--238}, the
%   CIPM recommends that the following rules for using the SI prefixes be observed:
%   \begin{enumerate}
%   \item Prefix symbols are printed in roman (upright) type without spacing between the prefix
%   symbol and the unit symbol. \item The grouping formed by the prefix symbol attached to the
%   unit symbol constitutes a new inseparable symbol (of a multiple of the unit concerned) which
%   can be raised to a positive or negative power and which can be combined with other unit
%   symbols to form compound unit symbols,
%   \begin{list}{}{}
%   \item \fe
%    \item \(\unit{1}{\centi\cubic\metre} = \cubic{(\power{10}{-2}\usk\metre)} = \power{10}{-6}\usk\cubic\metre \)
%    \item \(\unit{1}{\reciprocal{\centi\metre}} = \reciprocal{(\centid\usk\metre)} = \hectod\usk\reciprocal\metre\)
%    \item \(\unit{1}{\volt\per\centi\metre} = (\unit{1}{\volt})\per(\centid\usk\metre) = \hectod\usk\volt\per\metre\)
%   \end{list}
%   \item Compound prefixes, i.\,e., prefixes formed by juxtaposition of two or more SI prefixes
%   are not to be used,
%   \begin{list}{}{}
%   \item \fe \item \unit{1} {\pico\gram}\ (one picogram), \textit{but not} \unit{1}
%   {\milli\nano\gram}\ (one millinanogram)
%   \end{list}
%   \item A prefixes should never be used alone,
%   \begin{list}{}{}
%   \item \fe \item \megad\per\cubic\metre, \textit{but not}
%   \mega\per\cubic\metre
%   \end{list}
%   \end{enumerate}
%   \subsubsection{The kilogram}
%   It is important to note that the kilogram is the only SI unit with a prefix as part of its
%   name and symbol. Because multiple prefixes may not be used, in the case of the kilogram the
%   prefix names are used with the unit name `gram' and the prefix symbols are used with the
%   unit symbol \gram, \fe\\ \microd\usk\kilogram\ = \unit{1}{\milli\gram}\ (one
%   milligram), \textit{but not} \microd\usk\kilogram\ = \unit{1} {\micro\kilogram} ~(one
%   microkilogram).
%   \subsubsection{The `degree Celsius'} Except for the kilogram, any SI prefix may be used with any SI unit,
%   including the `degree Celsius' and its symbol \celsius, \fe \\
%   \millid\usk\celsius\ = \unit{1} {\milli\celsius}\ (one millidegree Celsius), \textit{or}
%   \megad\usk\celsius\ = \unit{1} {\mega\celsius}.
%   \subsubsection*{Note}
%   \textit{Because the SI prefixes strictly represent powers of \(10\), they should not be used to
%   represent powers of \(2\). Thus, one kilobit, or \unit{1} {\kilo\bit}, is \unit{1000} {\bit} and not \unit{\power{2}{10}} {\bit}
%   = \unit{1024} {\bit}.}
%
%   New prefixes for binary multiples have been proposed by Technical Committee of the
%   International Electrotechnical Commission (IEC) for use in information technology to
%   alleviate this ambiguity, and they are currently under consideration internationally.
%
%   \section{Units outside the SI}
%   Units that are outside the SI may be divided into three categories:
%   \begin{enumerate}
%   \item those units that are accepted for use with the SI;
%   \item those units that are temporarily accepted for use with the SI; and
%   \item those units that are not accepted for use with the SI and thus must strictly be avoided.
%   \end{enumerate}
%   \subsection{Units accepted for use with the SI}
%   The CIPM (1969) recognised that users of SI will also wish to employ with it certain units not part of it, but
%   which are important and are widely used. These units are given in table \arabic{tabel}. The combination of
%   units of this table with SI units to form compound units should be restricted to special cases in order not
%   to lose the advantage of the coherence of SI units.\\
%   \begin{tabbing}\label{tabel:accepted1}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxx}\hspace{0.5cm}
%   \= \textbf{xxxxxxxxxxxxxxxxxxxxxxx} \+ \kill \\ \textbf{Name} \> \textbf{Symbol} \>
%   \textbf{Value in SI units}\\ \\
%    minute (time)       \>  \minute    \>   \unit{1}{\minute} = \unit{60}{\second}   \\
%    hour         \>  \hour     \>   \unit{1}{\hour} = \unit{60}{\minute} = \unit{3600}{\second} \\
%    day    \>  \dday    \>   \unit{1}{\dday} = \unit{24}{\hour} = \(\unit{86\;400}{\second}\) \\
%    degree     \>  \degree    \>   \unit{1}{\degree} = \(\unit{(\pi/180)}{\radian}\)  \\
%    minute (plane angle)       \> \paminute     \>   \unit{1}{\paminute} = \unit{(1/60)}{\degree} = \(\unit{(\pi/10\;800)}{\radian}\)   \\
%    second (plane angle)      \> \pasecond     \>  \unit{1}{\pasecond} = \unit{(1/60)}{\paminute} = \(\unit{(\pi/648\;000)}{\radian}\)  \\
%    litre    \>  \litre, \liter\note{a}    \>   \unit{1}{\litre} = \unit{1}{\liter} = \unit{1}{\cubic{\deci\metre}} = \unit{\millid}{\cubic\metre} \\
%    tonne\note{b}    \>  \tonne \>   \unit{1}{\ton} = \unit{\kilod}{\kilogram}   \-\\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- Units accepted for use with the SI ---\\ \note{a}The alternative symbol for
%   the litre, \liter, was adopted by the CGPM in order to avoid the risk of confusion between the letter
%   l and the number \(1\). Thus, although both \litre\ and \liter\ are internationally accepted symbols for the
%   litre, to avoid this risk the symbol to be used in the United States is \liter.\\ \note{b}In some English-speaking
%   countries this unit is called `metric ton'.\\
%   \addtocounter{tabel}{1} \rule{\textwidth}{1pt}\\ \\
%   It is likewise necessary to recognise, outside the International System, some other units that are useful in
%   specialised fields, because their values expressed in SI units must be obtained by experiment, and are therefore
%   not known exactly (table \arabic{tabel}).
%   \begin{tabbing}\label{tabel:accepted2}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxxxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxx}\hspace{0.5cm}
%   \= \textbf{xxxxxxxxxx} \+ \kill \\ \textbf{Name} \> \textbf{Symbol} \>
%   \textbf{Definition}\\ \\
%    electronvolt      \>  \electronvolt    \>   \note{a}   \\
%    unified atomic mass unit    \>  \atomicmass     \> \note{b} \-\\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- Units accepted for use with the SI whose values in SI units are obtained experimentally ---\\
%   \note{a}The electronvolt is the kinetic energy acquired by an electron in passing through a potential difference
%   of \(1\) \volt\ in vacuum; \unit{1}{\electronvolt} = \(\unit{1.602\;177\;33\times\power{10}{-19}} {\joule}\) with a combined standard
%   uncertainty of \(\unit{0.000\;000\;49\times\power{10}{-19}} {\joule}\)\\
%   \note{b}The unified atomic mass unit is equal to \(1/12\) of the mass of an atom of the nuclide \(^{12}\mathrm{C}\);
%   \unit{1}{\atomicmass} = \(\unit{1.660\;540\;2\times\power{10}{-27}}{\kilogram}\) with a combined standard uncertainty of
%   \(\unit{0.000\;001\;0\times\power{10}{-27}}{\kilogram}\) \\
%   \addtocounter{tabel}{1} \rule{\textwidth}{1pt}
%   \subsection{Units temporarily accepted for use with the SI}
%   Because of existing practice in certain fields or countries, in 1978 the CIPM considered that it was permissible
%   for the units given in Table \arabic{tabel} to continue to be used with the SI until the CIPM considers that
%   their use is no longer necessary. However, these units must not be introduced where they are not presently used.
%   \begin{tabbing}\label{tabel:temporarily}
%   \hspace{0.5cm}\=\textbf{xxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxx}\hspace{0.5cm}
%   \= \textbf{xxxxxxxxxxxxxxxxxxxxxxx} \+ \kill \\ \textbf{Name} \> \textbf{Symbol} \>
%   \textbf{Value in SI units}\\ \\
%    nautical mile\note{a}       \>   \     \>   \unit{1}{nautical\ mile} = \unit{1852}{\metre}   \\
%    knot         \>  \     \>   \unit{1}{nautical\ mile\ per\ hour} = \unit{(1852/3600)}{\metre\per\second} \\
%    \aa ngstr\"{o}m    \>  \angstrom    \>   \unit{1}{\angstrom} = \unit{0.1}{\nano\metre} = \unit{\power{10}{-10}}{\metre} \\
%    are\note{b}          \>  \are       \>  \unit{1}{\are} = \unit{1}{\square{\deca\metre}} = \unit{\power{10}{2}}{\square\metre} \\
%    hectare\note{b}   \>  \hectare       \>  \unit{1}{\hectare} = \unit{1}{\square{\hecto\metre}} = \unit{\power{10}{4}}{\square\metre} \\
%    barn\note{c}   \>  \barn       \>  \unit{1}{\barn} = \unit{1}{\square{\femto\metre}} = \unit{\power{10}{-28}}{\square\metre} \\
%    bar\note{d}   \>  \bbar       \>  \unit{1}{\bbar} = \unit{0.1}{\mega\pascal} = \unit{\power{10}{5}}{\pascal} \\
%    gal\note{e}   \>  \gal       \>  \unit{1}{\gal} = \unit{1}{\centi\metre\per\second\squared} = \unit{\power{10}{-2}}{\metre\per\second\squared} \\
%    curie\note{f}   \>  \curie       \>  \unit{1}{\curie} = \(\unit{3.7\times\power{10}{10}}{\becquerel}\) \\
%    roentgen\note{g}   \>  \roentgen       \> \unit{1}{\roentgen} = \(\unit{2.58\times\power{10}{-4}}{\coulomb\per\second}\)  \\
%    rad\note{h}   \>  \rad       \>  \unit{1}{\rad} = \unit{1}{\centi\gray} = \unit{\power{10}{-2}}{\gray} \\
%    rem\note{i}   \>  \rem       \>  \unit{1}{\rem} = \unit{1}{\centi\sievert} = \unit{\power{10}{-2}}{\sievert} \\
%   \end{tabbing}
%   \textsc{Table \arabic{tabel}} --- Units in use temporarily with the SI ---\\
%   \note{a}The nautical mile is a special unit employed for marine and aerial navigation to express distances.
%   The conventional value given above was adopted by the First International Extraordinary Hydrographic Conference,
%   Monaco, 1929, under the name ``International nautical mile''. \\
%   \note{b}This unit and its symbol were adopted by the CIPM in 1879 (BIPM Proc. Verb. Com. Int. Poids et Mesures,
%   1879, p. 41) and are used to express agrarian areas. \\
%   \note{c}The barn is a special unit employed in nuclear physics to express effective cross sections. \\
%   \note{d}This unit and its symbol are included in Resolution 7 of the 9th CGPM (1948). \\
%   \note{e}The gal is a special unit employed in geodesy and geophysics to express the acceleration due to gravity. \\
%   \note{f}The curie is a special unit employed in nuclear physics to express activity of radionuclides (12th CGPM
%   (1964), Resolution 7). \\
%   \note{g}The roentgen is a special unit employed to express exposure of x or \(\gamma\) radiations. \\
%   \note{h}The rad is a special unit employed to express absorbed dose of ionising radiations. When there is risk of
%   confusion with the symbol for radian, rd may be used as the symbol for rad. \\
%   \note{i}The rem is a special unit used in radioprotection to express dose equivalent. \\
%   \addtocounter{tabel}{1} \rule{\textwidth}{1pt}\\ \\
%
%
%
%   \section{Last notes about correct usage of the SI}
%   The following points underline some of the important aspects about using SI units and their
%   symbols, and also mention some of the common errors that are made. The SI differs from some
%   of the older systems in that it has {\it definite} rules governing the way the units and
%   symbols are used.
%   \begin{itemize}
%   \item The unit of measure is the {\it `metre'}, not {\it `meter'}. The latter is a device used
%   for measuring things. (Unless you live in the USA - in which case you will just have to live
%   with the ambiguity.) \item Using a comma to separate groups of three digits is not
%   recommended - a space is preferable, since many countries use the comma as the decimal point
%   marker. Both the USA and UK use the `dot on the line' (full stop). So the following would be
%   correct: \(1\;234\;555.678\;990\). \item The term {\bf billion} should be avoided since in
%   most countries outside the USA (including the UK) it means a million-million (prefix tera),
%   whereas in the USA it means a thousand million (prefix giga). Likewise the term {\bf
%   trillion} means million-million-million (prefix exa) in most countries outside the USA.
%   \item The `litre' (`liter' in the US) is one of those units which is approved by the CGPM for
%   use with the metric system. The official unit of volume in the SI is the cubic metre.
%   However, since this is not convenient for much day-to-day use the CGPM has approved the use
%   of the `other unit', the litre. The litre represents a cubic decimetre and you may use
%   either the symbol `\litre' or `\liter'\footnote{Recommended symbol for the `liter' in the USA} (small
%   or capital `ell') to represent it. They do not approve using any prefixes other than milli
%   or micro with it. It was originally defined as the volume occupied by \unit{1} {\kilogram}\ of water.
%   Subsequently it was found that this was not precisely 1 cubic decimetre, so the term litre
%   was withdrawn. Later it was re-introduced officially as 1 cubic decimetre exactly. So,
%   \unit{1}{\litre} = \unit{1}{\cubic{\deci\metre}} = \unit{1}{\liter}.
%   \end{itemize}
%
%    \section{How to use the package}
%
%    \subsection{Loading}
%    Most features are controlled by package options that can be selected
%    when the package is loaded (e.\,g |\usepackage||[options]||{SIunits}|) or at
%    `runtime' as an optional argument(list) to the |\SIunits| command
%    (e.\,g. |\SIunits[options]|).
%
%    \begin{verbatim}
%    \documentclass[]{article}
%
%    \usepackage[options]{SIunits}
%
%    \begin{document}
%    \ldots
%    \SIunits[options]
%    \ldots
%    \end{document}
%    \end{verbatim}
%
%
%    \subsection{The options}\label{sec:options}
%    \changes{v0.02 Beta  2}{1998/09/10}{Code documentation corrections}
%    The features are controlled by package options that can be selected
%    when the package is loaded (e.\,g |\usepackage||[cdot]||{SIunits}|).
%
%    The package supports the following options:
%    \nopagebreak
%    \begin{labeling}{\hspace{12mm}}
%    \item[\opt{cdot}]
%    This mode provides the use of |\cdot| as spacing in units.
%    \item[\opt{thickspace}]
%    This mode provides the use of |\;| (thick math space) as spacing in units.
%    \item[\opt{mediumspace}]
%    This mode provides the use of |\:| (medium math space) as spacing in units.
%    \item[\opt{thinspace}]
%    This mode provides the use of |\,| (thin math space) as spacing in units.
%    \item[\opt{thickqspace}]
%    This mode provides the use of |\;| (thick math space) as spacing between numerical quantities and units.
%    \item[\opt{mediumqspace}]
%    This mode provides the use of |\:| (medium math space) as spacing between numerical quantities and units.
%    \item[\opt{thinqspace}]
%    This mode provides the use of |\,| (thin math space) as spacing between numerical quantities and units.
%    \item[\opt{derivedinbase}]
%    This mode provides the ready-to-use expressions of SI derived units in SI base units, e.\,g. \verb=\pascalbase= to get `\pascalbase'.
%    This option is used to make the generation of the documentation easier.
%    \item[\opt{derived}]
%    This mode provides the ready-to-use expressions of SI derived units in SI derived units, e.\,g. \verb=\derpascal= to get `\derpascal'.
%    This option is used to make the generation of the documentation easier.
%    \end{labeling}
%    \changes{v0.02 Beta  2}{1998/09/10}{Spacing examples table added}
%    \changes{v0.03 Beta  2}{1998/10/30}{Spacing examples table update}
%    See the next table for examples of the spacing options.
%    \begin{tabbing}\label{tabel:spacing}
%    \hspace{0.5cm}\=\textbf{xxxxxxxxxx}\hspace{0.5cm}\=\textbf{xxxxx} \+ \kill \\
%    \textbf{Option} \>  \textbf{Example}\\ \\
%    \opt{cdot} \>\(\newton\cdot\metre\)\\
%    \opt{thickspace}\> \(\newton\;\metre\)\\
%    \opt{mediumspace}\>\(\newton\:\metre\)\\
%    \opt{thinspace}\>\(\newton\,\metre\)\\
%    \opt{thickqspace}\> \(10\;\newton\cdot\metre\)\\
%    \opt{mediumqspace}\>\(10\:\newton\cdot\metre\)\\
%    \opt{thinqspace}\>\(10\,\newton\cdot\metre\)\\
%    \end{tabbing}
%    \changes{v0.02 Beta  6}{1998/09/24}{Inconsistencies removed in documentation}
%    \textsc{Table \arabic{tabel}} --- Spacing options ---\\
%    \addtocounter{tabel}{1} \rule{\textwidth}{1pt}\\ \\
%    \normalsize
%    \subsubsection{Conflicts with the \texttt{amssymb} package}
%    In the \verb=amssymb= package the command \verb=\square= is defined. This will cause error messages
%    when the \verb=amssymb= package is used in combination with the \ttSIunits\ package. To prevent
%    errors one can choose two different options:
%    \begin{labeling}{\hspace{15mm}}
%    \item[\opt{amssymb}]This option redefines the \texttt{amssymb} command \verb=\square= to get the desired
%    \ttSIunits\ definition of the command.\\ \textbf{Note: }When using this option, the \texttt{amssymb} command
%    \verb=\square= can \textbf{not} be used.
%    \item[\opt{squaren}]This option defines a new command \verb=\squaren= that can be used instead of the
%    \ttSIunits\ command \verb=\square=.\\ \textbf{Note: }When using this option, the \texttt{amssymb} definition for
%    \verb=\square= is used.
%    \end{labeling}
%    \changes{v0.06 Beta  2}{1998/04/07}{amssymb conflicts section added to documentation}
%
%    \section*{Command Reference}
%    \subsection{How to compose units in your text.}
%    The purpose of the \ttSIunits\ package is: to give an author an intuitive system for writing
%    units.
%    Just type (in \LaTeX-kind commands) what you would say: \verb=\kilogram= or \verb=\degreecelsius= to get
%    `\kilogram' or `\celsius'.
%    \subsubsection{The SI base units}
%    \begin{tabbing} \label{commands:base}
%    \hspace{0.5cm}\= \textbf{xxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\metre= \> \metre\ --- The command \verb=\meter= can also be used.
%    \\ \verb=\kilogram= \> \kilogram
%    \\ \verb=\second= \> \second
%    \\ \verb=\ampere= \> \ampere
%    \\ \verb=\kelvin= \> \kelvin
%    \\ \verb=\mole= \> \mole
%    \\ \verb=\candela= \> \candela
%    \end{tabbing}
%
%    \subsubsection{The SI derived units}
%    \begin{tabbing} \label{commands:derived}
%    \hspace{0.5cm}\= \textbf{xxxxxxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\hertz=    \>  \hertz
%    \\ \verb=\newton=   \>  \newton
%    \\ \verb=\pascal= \>  \pascal
%    \\ \verb=\joule=  \>  \joule
%    \\ \verb=\watt=   \>  \watt
%    \\ \verb=\coulomb= \>  \coulomb
%    \\ \verb=\volt=  \>  \volt
%    \\ \verb=\farad=  \> \farad
%    \\ \verb=\ohm=  \> \ohm
%    \\ \verb=\siemens=  \> \siemens
%    \\ \verb=\weber=  \> \weber
%    \\ \verb=\tesla=  \> \tesla
%    \\ \verb=\henry=  \> \henry
%    \\ \verb=\degreecelsius=  \> \celsius\ --- The command \verb=\celsius= can also be used.
%    \\ \verb=\lumen= \>  \lumen
%    \\ \verb=\lux=  \> \lux
%    \\ \verb=\becquerel=  \> \becquerel
%    \\ \verb=\gray=  \> \gray
%    \\ \verb=\sievert= \> \sievert
%   \end{tabbing}
%    \subsubsection{The SI prefixes}
%    To use the prefixes with SI units simply place them before the unit, e.\,g. \verb=\milli\ampere=,
%    \verb=\deca\metre= (or \verb=\deka\meter=) or \verb=\mega\ohm= to get: `\milli\ampere', `\deca\metre' or `\mega\ohm'.
%    \begin{tabbing} \label{commands:prefixes}
%    \hspace{0.5cm}\= \textbf{xxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\yocto=  \>  \yocto
%    \\ \verb=\zepto=  \>  \zepto
%    \\ \verb=\atto=  \>  \atto
%    \\ \verb=\femto=  \>  \femto
%    \\ \verb=\pico=  \>  \pico
%    \\ \verb=\nano=  \>  \nano
%    \\ \verb=\micro=  \>  \micro
%    \\ \verb=\milli=  \>  \milli
%    \\ \verb=\centi=  \>  \centi
%    \\ \verb=\deci=  \>  \deci
%    \\ \verb=\deca=  \>  \deca\ --- The command \verb=\deka= can also be used.
%    \\ \verb=\hecto=  \>  \hecto
%    \\ \verb=\kilo=  \>  \kilo
%    \\ \verb=\mega=  \>  \mega
%    \\ \verb=\giga=  \>  \giga
%    \\ \verb=\tera=  \>  \tera
%    \\ \verb=\peta=  \>  \peta
%    \\ \verb=\exa=  \>  \exa
%    \\ \verb=\zetta=  \>  \zetta
%    \\ \verb=\yotta=  \>  \yotta\\
%    \end{tabbing}\enlargethispage{\baselineskip}
%    \subsubsection{Decimal values of the SI prefixes}
%    Decimal values of the prefixes can be made by adding |d| behind the prefix command:\\
%    \begin{tabbing} \label{commands:prefixesd}
%    \hspace{0.5cm}\= \textbf{xxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\yoctod=  \>  \yoctod
%    \\ \verb=\zeptod=  \>  \zeptod
%    \\ \verb=\attod=  \>  \attod
%    \\ \verb=\femtod=  \>  \femtod
%    \\ \verb=\picod=  \>  \picod
%    \\ \verb=\nanod=  \>  \nanod
%    \\ \verb=\microd=  \>  \microd
%    \\ \verb=\millid=  \>  \millid
%    \\ \verb=\centid=  \>  \centid
%    \\ \verb=\decid=  \>  \decid
%    \\ \verb=\decad=  \>  \decad\ --- The command \verb=\dekad= can also be used.
%    \\ \verb=\hectod=  \>  \hectod
%    \\ \verb=\kilod=  \>  \kilod
%    \\ \verb=\megad=  \>  \megad
%    \\ \verb=\gigad=  \>  \gigad
%    \\ \verb=\terad=  \>  \terad
%    \\ \verb=\petad=  \>  \petad
%    \\ \verb=\exad=  \>  \exad
%    \\ \verb=\zettad=  \>  \zettad
%    \\ \verb=\yottad=  \>  \yottad
%   \end{tabbing}
%
%   \subsubsection{Division or multiplication of SI units}
%   The next step is the formation of units based on division and/or multiplication of SI units.
%   \paragraph{Division}
%   How to get the unit of speed?
%   \begin{enumerate}
%   \item Write down the unit in words: \verb=metre per second=
%   \item Replace the spaces with backlashes to get the command: \verb=\metre\per\second\=
%   \item The result is: `\metre\per\second'.
%   \end{enumerate}
%   Simple! Ready!
%   \paragraph{Multiplication}
%    Now an example of multiplication of units, the unit of torque (newton metre):
%   \begin{enumerate}
%   \item Write down the unit in words: \verb=newton metre=
%   \item To get an separation character between the two units use the command |\usk| (unitskip): \verb=\newton\usk\metre=
%   \item The result is: `\newton\usk\metre'. The spacing between the units depends on the spacing
%   options (see: page \pageref{sec:options}).
%   \end{enumerate}
%   \paragraph{Mixed case}
%   The mixed case should be simple now; the unit of thermal conductivity (watt per metre kelvin):
%   \begin{enumerate}
%   \item Use your just-learned-knowledge:\verb=\watt\per\metre\usk\kelvin=
%   \item The result is: `\wattpermetrekelvin'.
%   \end{enumerate}
%   Now, you can do it all in one step! Intuitive \& simple.
%
%   \subsubsection{Raising SI units to a power}
%   The \ttSIunits\ package provides a set of functions to get units raised to a particular power.
%   \paragraph{Squaring and cubing}
%   How to get the units of area (square metre) and volume (cubic metre)?
%   \begin{enumerate}
%   \item Write down the unit in words: \verb=square metre= and \verb=cubic metre=
%   \item Replace the spaces with backlashes to get the commands: \verb=\square\metre= and \verb=\cubic\metre=
%   \item The result is: ` \square\metre' and `\cubic\metre'.
%   \end{enumerate}
%   I can hear you say: ``We only use the word `square' before the unit metre, normally we place
%   the word `squared' behind the unit name.''. OK, lets try: \verb=\second\squared= and
%   \verb=\second\cubed= gives: `\second\squared' and `\second\cubed'.
%   Thus, no problem.
%   \paragraph{The reciprocal, reciprocal squaring and - cubing}
%   How to get negative powers?
%   \begin{enumerate}
%   \item Use \verb=\rpsquare= or \verb=\rpsquared=, and \verb=\rpcubic= and \verb=\rpcubed=
%   \item \Fe \verb=\rpsquare\metre= and \verb=\second\rpcubed=
%   \item The result is: ` \rpsquare\metre' and `\second\rpcubed'.
%   \end{enumerate}
%   Normally, we leave out the exponent \(1\), but sometimes we want to use the exponent \(-1\).
%   How to form the unit of frequency (reciprocal second = \hertz)
%   \begin{enumerate}
%   \item Write down the unit in words: \verb=reciprocal second=,
%   \item Replace the spaces with backlashes to get the commands: \verb=\reciprocal\second=,
%   \item The result is: `\reciprocal\second'.
%   \end{enumerate}
%   \paragraph{The power function}
%   The |power| macro has been added to be able to form the wildest types of power raising:
%   \verb=\power{10}{35}= gives: \power{10}{35}.
%
%    \subsubsection{Quantities and units}
%    Use the command |\unit| to get consistent spacing between numerical quantities and units. Usage:\\
%    \verb=\unit {120} {\kilo\meter\per\hour}= gives: \unit {120} {\kilo\meter\per\hour}.
%    \changes{v0.03 Beta  2}{1998/10/30}{documentation update}
%
%   \subsubsection{Units outside the SI}
%    \begin{tabbing} \label{commands:outside}
%    \hspace{0.5cm}\= \textbf{xxxxxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\angstrom= \>\angstrom
%    \\ \verb=\are=    \> \are
%    \\ \verb=\atomicmass= \>\atomicmass
%    \\ \verb=\barn=    \>\barn
%    \\ \verb=\bbar= \>\bbar\ --- The command \verb=\bar= was already defined.
%    \\ \verb=\curie= \>\curie
%    \\ \verb=\dday= \> \dday\ --- The command \verb=\day= was already defined.
%    \\ \verb=\degree=\>\degree
%    \\ \verb=\electronvolt=\>\electronvolt
%    \\ \verb=\gal= \>\gal
%    \\ \verb=\gram= \> \gram
%    \\ \verb=\hectare= \>\hectare
%    \\ \verb=\hour=\>\hour
%    \\ \verb=\liter= \>\liter\ --- The US unit for `litre'.
%    \\ \verb=\litre= \> \litre
%    \\ \verb=\minute= \>\minute
%    \\ \verb=\paminute=\>\paminute\ --- The command \verb=\minute= was already defined.
%    \\ \verb=\pasecond=\>\pasecond\ --- The command \verb=\second= was already defined.
%    \\ \verb=\rad= \>\rad
%    \\ \verb=\rem= \>\rem
%    \\ \verb=\roentgen=\>\roentgen
%    \\ \verb=\rperminute= \>\rperminute
%    \\ \verb=\tonne= \>\tonne\ --- The command \verb=\ton= can also be used.
%    \end{tabbing}
%    \subsubsection{Ready-to-use units}
%    \begin{tabbing} \label{commands:prefab}
%    \changes{v0.05 Beta 1}{1999/02/01}{Inconsistencies in Ready-to-use units corrected}
%    \hspace{0.5cm}\= \textbf{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}\hspace{1cm} \= \textbf{xxxxx}\kill \+
%    \\ \textbf{Command}\> \textbf{Gives}\\
%    \\ \verb=\amperemetresecond= \>  \amperemetresecond
%    \\ \verb=\amperepermetre = \> \amperepermetre
%    \\ \verb=\amperepermetrenp  = \> \amperepermetrenp
%    \\ \verb=\amperepersquaremetre= \> \amperepersquaremetre
%    \\ \verb=\amperepersquaremetrenp= \> \amperepersquaremetrenp
%    \\ \verb=\candelapersquaremetre = \> \candelapersquaremetre
%    \\ \verb=\candelapersquaremetrenp  = \> \candelapersquaremetrenp
%    \\ \verb=\coulombpercubicmetre= \> \coulombpercubicmetre
%    \\ \verb=\coulombpercubicmetrenp= \>  \coulombpercubicmetrenp
%    \\ \verb=\coulombperkilogram  = \> \coulombperkilogram
%    \\ \verb=\coulombperkilogramnp = \> \coulombperkilogramnp
%    \\ \verb=\coulombpermol = \> \coulombpermol
%    \\ \verb=\coulombpermolnp= \> \coulombpermolnp
%    \\ \verb=\coulombpersquaremetre= \> \coulombpersquaremetre
%    \\ \verb=\coulombpersquaremetrenp= \>  \coulombpersquaremetrenp
%    \\ \verb=\cubicmetre= \> \cubicmetre
%    \\ \verb=\faradpermetre = \> \faradpermetre
%    \\ \verb=\faradpermetrenp  = \> \faradpermetrenp
%    \\ \verb=\graypersecond= \> \graypersecond
%    \\ \verb=\graypersecondnp= \> \graypersecondnp
%    \\ \verb=\henrypermetre = \> \henrypermetre
%    \\ \verb=\henrypermetrenp = \> \henrypermetrenp
%    \\ \verb=\jouleperkelvin  = \> \jouleperkelvin
%    \\ \verb=\jouleperkelvinnp  = \> \jouleperkelvinnp
%    \\ \verb=\jouleperkilogram = \> \jouleperkilogram
%    \\ \verb=\jouleperkilogramnp = \> \jouleperkilogramnp
%    \\ \verb=\joulepermole=\> \joulepermole
%    \\ \verb=\joulepermolenp=\> \joulepermolenp
%    \\ \verb=\joulepermolekelvin = \> \joulepermolekelvin
%    \\ \verb=\joulepermolekelvinnp = \> \joulepermolekelvinnp
%    \\ \verb=\joulepersquaremetre = \> \joulepersquaremetre
%    \\ \verb=\joulepersquaremetrenp = \> \joulepersquaremetrenp
%    \\ \verb=\joulepertesla = \> \joulepertesla
%    \\ \verb=\jouleperteslanp = \> \jouleperteslanp
%    \\ \verb=\kilogrammetrepersecond  = \> \kilogrammetrepersecond
%    \\ \verb=\kilogrammetrepersecondnp = \> \kilogrammetrepersecondnp
%    \\ \verb=\kilogrammetrepersquaresecond = \> \kilogrammetrepersquaresecond
%    \\ \verb=\kilogrammetrepersquaresecondnp= \> \kilogrammetrepersquaresecondnp
%    \\ \verb=\kilogrampercubicmetre= \> \kilogrampercubicmetre
%    \\ \verb=\kilogrampercubicmetrenp= \> \kilogrampercubicmetrenp
%    \\ \verb=\kilogramperkilomole = \> \kilogramperkilomole
%    \\ \verb=\kilogramperkilomolenp= \> \kilogramperkilomolenp
%    \\ \verb=\kilogrampermetre = \> \kilogrampermetre
%    \\ \verb=\kilogrampermetrenp  = \> \kilogrampermetrenp
%    \\ \verb=\kilogrampersecond = \> \kilogrampersecond
%    \\ \verb=\kilogrampersecondnp= \> \kilogrampersecondnp
%    \\ \verb=\kilogrampersquaremetre = \> \kilogrampersquaremetre
%    \\ \verb=\kilogrampersquaremetrenp= \> \kilogrampersquaremetrenp
%    \\ \verb=\kilogrampersquaremetresecond = \> \kilogrampersquaremetresecond
%    \\ \verb=\kilogrampersquaremetresecondnp= \> \kilogrampersquaremetresecondnp
%    \\ \verb=\kilogramsquaremetre = \> \kilogramsquaremetre
%    \\ \verb=\kilogramsquaremetrenp= \> \kilogramsquaremetrenp
%    \\ \verb=\kilogramsquaremetrepersecond= \> \kilogramsquaremetrepersecond
%    \\ \verb=\kilogramsquaremetrepersecondnp= \>  \kilogramsquaremetrepersecondnp
%    \\ \verb=\kilowatthour= \>  \kilowatthour
%    \\ \verb=\metrepersquaresecond= \>\metrepersquaresecond
%    \\ \verb=\metrepersquaresecondnp= \>\metrepersquaresecondnp
%    \\ \verb=\molepercubicmetre= \> \molepercubicmetre
%    \\ \verb=\molepercubicmetrenp= \> \molepercubicmetrenp
%    \\ \verb=\newtonpercubicmetre = \> \newtonpercubicmetre
%    \\ \verb=\newtonpercubicmetrenp = \> \newtonpercubicmetrenp
%    \\ \verb=\newtonperkilogram = \> \newtonperkilogram
%    \\ \verb=\newtonperkilogramnp  = \> \newtonperkilogramnp
%    \\ \verb=\newtonpersquaremetre = \> \newtonpersquaremetre
%    \\ \verb=\newtonpersquaremetrenp= \> \newtonpersquaremetrenp
%    \\ \verb=\ohmmetre = \> \ohmmetre
%    \\ \verb=\pascalsecond= \>  \pascalsecond
%    \\ \verb=\persquaremetresecond = \> \persquaremetresecond
%    \\ \verb=\persquaremetresecondnp= \> \persquaremetresecondnp
%    \\ \verb=\radianpersecond= \>  \radianpersecond
%    \\ \verb=\radianpersecondnp= \> \radianpersecondnp
%    \\ \verb=\radianpersquaresecond= \> \radianpersquaresecond
%    \\ \verb=\radianpersquaresecondnp= \> \radianpersquaresecondnp
%    \\ \verb=\squaremetre= \> \squaremetre
%    \\ \verb=\squaremetrepercubicmetre= \> \squaremetrepercubicmetre
%    \\ \verb=\squaremetrepercubicmetrenp= \> \squaremetrepercubicmetrenp
%    \\ \verb=\squaremetrepernewtonsecond= \>  \squaremetrepernewtonsecond
%    \\ \verb=\squaremetrepernewtonsecondnp= \> \squaremetrepernewtonsecondnp
%    \\ \verb=\squaremetrepersecond = \> \squaremetrepersecond
%    \\ \verb=\squaremetrepersecondnp  = \> \squaremetrepersecondnp
%    \\ \verb=\squaremetrepersquaresecond  = \> \squaremetrepersquaresecond
%    \\ \verb=\squaremetrepersquaresecondnp = \> \squaremetrepersquaresecondnp
%    \\ \verb=\voltpermetre= \> \voltpermetre
%    \\ \verb=\voltpermetrenp= \>  \voltpermetrenp
%    \\ \verb=\wattpercubicmetre = \> \wattpercubicmetre
%    \\ \verb=\wattpercubicmetrenp= \> \wattpercubicmetrenp
%    \\ \verb=\wattperkilogram= \> \wattperkilogram
%    \\ \verb=\wattperkilogramnp= \> \wattperkilogramnp
%    \\ \verb=\wattpersquaremetre  = \> \wattpersquaremetre
%    \\ \verb=\wattpersquaremetrenp = \> \wattpersquaremetrenp
%    \\ \verb=\wattpersquaremetresteradian = \> \wattpersquaremetresteradian
%    \\ \verb=\wattpersquaremetresteradiannp = \> \wattpersquaremetresteradiannp
%    \end{tabbing}
%
%    \section{How the package works}
%
%    \subsection{Compatibility}
%    The package has been tested using:
%    \begin{enumerate}
%    \item MiK\TeX\ 1.10\textit{b}, including \LaTeXe\ standard classes (\LaTeXe{} [1997/12/01] patch level 1)
%    and \TeX\ 3.14159, both under Microsoft Windows 95 and Windows NT 4.0.
%    \item MiK\TeX\ 1.11 , including \LaTeXe\ standard classes (\LaTeXe{} [1998/06/01])
%    and \TeX\ 3.14159, both under Microsoft Windows 95 and Windows NT 4.0.
%    \end{enumerate}
%    The |SIunits| package mainly uses (and relies on) the \LaTeX\ command
%    |\newcommand| which is expected to keep its current meaning in future
%    \LaTeX\ releases.
%    \subsection{Known problems and limitations}
%    \begin{enumerate}
%    \item When you don't have the AMS font |eurm10| add the next command to the preamble of your document:\\
%    \verb=\NoAMS=.
%    \item The amssymb package defines the \verb=\square= command. Two possible solutions to avoid
%    conflicts:
%    \begin{itemize}
%    \item Use option \opt{amssymb}: \verb=\usepackage[amssymb]{SIunits}=.
%    When using this option the amssymb command \verb=\square= is redefined to the SIunits command.
%    \item Use option \opt{squaren}: \verb=\usepackage[squaren]{SIunits}=.
%    When using this option the amssymb command \verb=\square= is not redefined. Use the newly defined SIunits command
%    \verb=\squaren= instead of \verb=\square= to get the desired behaviour.
%    \end{itemize}
%    \textbf{Note: }Load \ttSIunits\ package after \texttt{amssymb} package.
%    \end{enumerate}
%    No further known problems or limitations. That doesn't mean this package is bug free, but it
%    indicates the lack of testing that's been done on the package.
%
%    \subsection{Sending a bug report}
%    Reports of new bugs in the package are most welcome.
%    However, I do \textbf{not} consider this to be a `supported'
%    package. This means that there is no guarantee I (or
%    anyone else) will put any effort into fixing the bug (of course I will try to find some time).
%    But, on the other hand, someone may try debugging, so filing a
%    bug report is always a good thing to do! (If nothing else,
%    your discoveries may end up in future releases of this
%    document.) Before filing a bug report, please take the
%    following actions:
%    \begin{enumerate}
%    \item Ensure your problem is not due to your input file;
%    \item Ensure your problem is not due to your own
%    package(s) or class(es);
%    \item Ensure your problem is not covered in the section ``Known
%    problems and limitations'' above;
%    \item Try to locate the problem by writing a minimal
%    \LaTeXe\ input file which reproduces the problem. Include the command\\
%    \verb+\setcounter{errorcontextlines}{999}+\\ in your input;
%    \item Run your file through \LaTeXe;
%    \item Send a description of your problem, the input file and the
%    log file via e-mail to: \texttt{m.heldoorn@physiology.medfac.leidenuniv.nl}.
%    \end{enumerate}
%
%    \section{In conclusion}
%
%    \subsection{Acknowledgements}
%    I want to thank \textsf{Werenfried Spit} (|w.spit@WITBO.NL|)
%    answering my question to |TEX-NL@NIC.SURFNET.NL| about the ``power functie'',
%    as well as \textsf{Hans Hagen} (|pragma@WXS.NL|) for
%    the kind reaction to that question.\\
%    \changes{v0.02 Final Release}{1998/10/09}{Acknowledgements updated}
%    \begin{labeling}{\hspace{12mm}}
%    \item[\opt{v0.01}: Typos]
%    J\"{u}rgen von Haegen ({\tt vonHagen@engr.psu.edu})
%    \item[\opt{v0.02 Beta  1}: {\tt addunit} macro added]
%    Hint: Hans Bessem\\ ({\tt j.m.bessem@wbmt.tudelft.nl})
%    \item[\opt{v0.02 Beta  4}: Typos]
%    Rafael Rodriguez Pappalardo ({\tt rafapa@cica.es})
%    \item[\opt{v0.02 Beta  5}: Tips/non-SI units]
%    Timothy C. Burt\\ ({\tt tcburt@comp.uark.edu})
%    \item[\opt{v0.02 Beta  7}: {\tt angstrom} definition changed]
%    Hint: Lutz Schwalowsky\\ ({\tt schalow@mineralogie.uni-hamburg.de});
%    Solution: Piet van Oostrum ({\tt piet@cs.uu.nl})
%    \item[\opt{v0.04}: {\tt ohm} definition corrected]
%    J\"{u}rgen von Haegen ({\tt vonHagen@engr.psu.edu})
%    \item[\opt{v0.06}: Conflict with \texttt{amssymb} solved] thanks to
%    Timothy C. Burt\\ ({\tt tcburt@comp.uark.edu})
%    \end{labeling}
%
%    \subsection{References}
%    \begin{enumerate}
%    \item {\sf National Institute of Standards and Technology Special Publication 330},\ {\it  The International System of Units (SI), 1991 Edition}, by Barry~N.~Taylor, 62 p.:
%    \verb=http://physics.nist.gov/Document/sp330.pdf=
%    \item {\sf National Institute of Standards and Technology Special Publication 811},\ {\it  Guide for the Use of the International System of Units (SI), 1995 Edition}, by Barry~N.~Taylor, 84 p.:
%    \verb=http://physics.nist.gov/Document/sp811.pdf=
%    \item {\sf National Institute of Standards and Technology},\ \textit{Diagram of SI unit relationships:}
%    \verb=http://physics.nist.gov/cuu/Units/SIdiagram2.html=
%    \item {\sf National Physical Laboratory},
%    {\it The International System of Units:} \\ \verb=http://www.npl.co.uk/npl/reference/si_units.html=
%    \item {\sf National Institute of Standards and Technology}, \\
%    {\it The NIST reference on Constants, Units and Uncertainty:} \\
%    \verb=http://physics.nist.gov/cuu/Units/introduction.html=
%    \item {\sf David Barlett},
%    {\it The Metric System: a concise reference guide:} \\ \verb=http://subnet.virtual-pc.com/ba424872/=
%
%    \end{enumerate}
%
%    \subsection{Bye}
%    I hope that some users will find the package
%    useful and not too bugful. :--) \\Comments and suggestions
%    for improvements are always most welcome!\\*[3mm]
%    {\itshape \LaTeX, enjoy it! \raisebox{-\baselineskip}[0pt][0pt]{marcel h.}}
%
%
%    \StopEventually{\vfill\hfill\scriptsize Copyright \copyright 1998 by Marcel Heldoorn}
%    \newpage
%    \section{The Magic Code}
%    \subsection{Hello world}
%
%    \iffalse
%<*package>
%    \fi
%    First, we announce the package.
%    \begin{macrocode}
 \NeedsTeXFormat{LaTeX2e}[1997/12/01]
 \ProvidesPackage{SIunits}[\filedate\space v\fileversion\space \packagename (MH)]
 \typeout{Package: `\packagename' v\fileversion\space <\filedate> (MH)}
 \typeout{\packagemessage}
%    \end{macrocode}
%    \subsubsection{The upright (roman) `mu'}
%    The next four lines of code are necessary to get an upright (roman) mu (Greek `em').
%
%    \begin{macrocode}
 \DeclareFontFamily{OML}{eur}{\skewchar\font127}
 \DeclareFontShape{OML}{eur}{m}{n}{<5> <6> <7> <8> <9> gen * eurm <10><10.95><12><14.4><17.28><20.74><24.88>eurm10}{}
 \DeclareSymbolFont{greek}{OML}{eur}{m}{n}
%    \end{macrocode}
%    \DescribeMacro{\upmu}
%    \begin{macrocode}
 \DeclareMathSymbol{\upmu}{\mathord}{greek}{"16}
%    \end{macrocode}
%
%    \subsection{Option handling}
%
%    Every package option is passed to the macro |\SIunits@execopt|.
%    \begin{macrocode}
\DeclareOption*{\SIunits@execopt\CurrentOption}
%    \end{macrocode}
%
%
%    \DescribeMacro{\SIunits}
%    The |\SIunits| macro allows runtime option requests. Every argument of
%    the optional argument list is passed to the macro |\SIunits@execopt|.
%    The options \opt{thickspace \& thickqspace} is selected by default.
%
%    \begin{macrocode}
\newcommand*\SIunits[1][thickspace,thickqspace]{\@for\SIunits@@:=#1%
  \do{\SIunits@execopt\SIunits@@}}
%    \end{macrocode}
%
%
%    \DescribeMacro{\SIunits@execopt}
%    Every execution of this macro with an argument \(n\) leads to the
%    execution of a macro |\SIunits@opt@|\(n\) or a warning if no such exists.
%
%    \begin{macrocode}
\newcommand*\SIunits@execopt[1]{\@ifundefined{SIunits@opt@#1}%
  {\PackageWarning{SIunits}{Requested option `#1' not provided}}%
  {\@nameuse{SIunits@opt@#1}}}
%    \end{macrocode}
%
%    \subsection{Spacing options}
%    \subsubsection{The \opt{thickspace} mode}
%
%    \DescribeMacro{\SIunits@opt@thickspace}
%    This macro provides a thick math space (\verb=\;=) between units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@thickspace{%
  \renewcommand{\usk}{\ensuremath{\;}}
    \typeout{Option `thickspace' provided! ^^J}}
%    \end{macrocode}
%
%    \subsubsection{The \opt{mediumspace} mode}
%    \DescribeMacro{\SIunits@opt@mediumspace}
%    This macro provides a medium math space (\verb=\:=) between units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@mediumspace{%
  \renewcommand{\usk}{\ensuremath{\:}}
      \typeout{Option `mediumspace' provided! ^^J}}
%    \end{macrocode}
%
%    \subsubsection{The \opt{thinspace} mode}
%    \DescribeMacro{\SIunits@opt@thinspace}
%    This macro provides a thin math space (\verb=\,=) between units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@thinspace{%
  \renewcommand{\usk}{\ensuremath{\,}}
      \typeout{Option `thinspace' provided! ^^J}}
%    \end{macrocode}
%
%    \subsubsection{The \opt{cdot} mode}
%    \DescribeMacro{\SIunits@opt@cdot}
%    This macro provides a \verb=\cdot= (\(\cdot\)) between units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@cdot{%
  \renewcommand{\usk}{\ensuremath                                 {\cdot}}
      \typeout{Option `cdot' provided! ^^J}}
%    \end{macrocode}
%
%    \subsection{Spacing between quantities and units options}
%    \subsubsection{The \opt{thickqspace} mode}
%
%    \DescribeMacro{\SIunits@opt@thickqspace}
%    This macro provides a thick math space (\verb=\;=) between quantities and units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@thickqspace{%
  \renewcommand{\qsk}{\ensuremath{\;}}
    \typeout{Option `thickqspace' provided! ^^J}}
%    \end{macrocode}
%    \subsubsection{The \opt{mediumqspace} mode}
%
%    \DescribeMacro{\SIunits@opt@mediumqspace}
%    This macro provides a medium math space (\verb=\:=) between quantities and units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@mediumqspace{%
  \renewcommand{\qsk}{\ensuremath{\:}}
    \typeout{Option \mediumqspace' provided! ^^J}}
%    \end{macrocode}
%
%    \subsubsection{The \opt{thinqspace} mode}
%
%    \DescribeMacro{\SIunits@opt@thinqspace}
%    This macro provides a thin math space (\verb=\;=) between quantities and units.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@thinqspace{%
  \renewcommand{\qsk}{\ensuremath{\,}}
    \typeout{Option `thinqspace' provided! ^^J}}
%    \end{macrocode}
%    \subsection{Conflict handling options}
%    \subsubsection{The \opt{amssymb} option}
%
%    \DescribeMacro{\SIunits@opt@amssymb}
%  \changes{v0.06 Beta 2}{1999/04/06}{amssymb option added}
%    \begin{macrocode}
\newif\ifredefsquare\redefsquarefalse
\newcommand\SIunits@opt@amssymb{\redefsquaretrue}
%    \end{macrocode}
%
%    \subsubsection{The \opt{squaren} option}
%
%    \DescribeMacro{\SIunits@opt@squaren}
%  \changes{v0.06 Beta 2}{1999/04/06}{squaren option added}
%    \begin{macrocode}
\newif\ifdefsquaren\defsquarenfalse
\newcommand\SIunits@opt@squaren{\defsquarentrue}
%    \end{macrocode}
%
%    \subsection{International needs}
%    \DescribeMacro{\meter}
%    \DescribeMacro{\deka}
%    \DescribeMacro{\dekad}
%    To prevent international problems, one can use both |\meter| and |\metre| for the SI length
%    unit, and |\deka| and |\dekad| for the SI prefix commands |\deca| and |\decad|.
%    \begin{macrocode}
\newcommand{\meter}{\metre}
\newcommand{\deka}{\deca}
\newcommand{\dekad}{\decad}
%    \end{macrocode}
%    \subsection{Personal needs}
%    \DescribeMacro{\NoAMS}
%    The |\NoAMS| macro has to be added in the preamble, when you don't have the AMS font |eurm10|
%    \begin{macrocode}
\newcommand{\NoAMS}{\renewcommand {\micro}{\ensuremath{\mathrm{\mu}}}}
%    \end{macrocode}
%    \changes{v0.03 Beta  2}{1998/10/30}{{\tt NoAMS} command added}
%    \DescribeMacro{\addunit}
%    The |\addunit| macro gives one the possibility to add units. This possibility was added after a lot of questions for
%    support of non SI units, that can not be added to this package (it's called \textit{SI}units!). \\Usage: \verb=\addunit{\foot}{ft}=;
%    then the unit can be used: \verb=1 \foot= gives 1 ft.
%    \changes{v0.02 Beta  1}{1998/09/09}{{\tt addunit} command added}
%    \begin{macrocode}
\newcommand*{\addunit}[2]{\newcommand{#1}{\ensuremath{\mathrm{#2}}}}
%    \end{macrocode}
%    \DescribeMacro{\unitskip}
%    The |\unitskip| macro gives one the possibility to choose spacing characters that
%    are not already defined, by the spacing options (page \pageref{sec:options}). It also
%    gives the possibility to use various spacing character in your documents.
%    \begin{macrocode}
\newcommand*{\unitskip}[1]{\renewcommand{\usk}{\ensuremath{#1}}}
%    \end{macrocode}
%    \DescribeMacro{\quantityskip}
%    The |\quantityskip| macro gives one the possibility to choose spacing characters that
%    are not already defined, by the spacing options (page \pageref{sec:options}). It also
%    gives the possibility to use various spacing character in your documents.
%    \begin{macrocode}
\newcommand*{\quantityskip}[1]{\renewcommand{\qsk}{\ensuremath{#1}}}
%    \end{macrocode}
%    \changes{v0.03 Beta  2}{1998/10/30}{{\tt quantityskip} command added}
%    \subsection{Spacing units}
%    \DescribeMacro{\per}
%    \DescribeMacro{\usk}
%    \DescribeMacro{\qsk}
%    \changes{v0.03 Beta  2}{1998/10/30}{{\tt qsk} command added}
%    In version \fileversion\ of the \ttSIunits\ package, one has to do the spacing of units by hand. I have plans to get
%    some things automated in a future version. The |\per| macro gives |/| to be used in a quotient of two units; |\usk|
%    (\textbf{u}nit\textbf{sk}ip) makes a thick math space by default, but can be changed by the spacing options
%    (page \pageref{sec:options}) or the |\unitskip| command. Usage:\\ \verb=\metre\per\second= (unit of speed) gives:
%    \(\mathrm{m/s}\) \\ \verb=\newton\usk\metre= (unit of torque) gives: \(\mathrm{N}\,\mathrm{m}\).\\
%    |\qsk| (\textbf{q}uantity \textbf{sk}ip) makes a thick math space
%    by default, but can be changed by the options for spacing between quantity and unit
%    (page \pageref{sec:options}) or the |\quantityskip| command. |\qsk| is used in the |\unit| macro.
%    \begin{macrocode}
\newcommand{\per}{\ensuremath{\mathrm{/}}}
\newcommand{\usk}{\ensuremath{\;}}
\newcommand{\qsk}{\ensuremath{\;}}
%    \end{macrocode}
%    \subsection{Spacing between numerical quantities and unit}
%    \DescribeMacro{\unit}
%    The |\unit| macro is used to typeset conjunction of a numerical quantity and a unit. Usage:
%    \verb=\unit {120} {\kilo\meter\per\hour} = \unit {33.3} {\meter\per\second}= to get:
%    \unit {120} {\kilo\meter\per\hour} = \unit {33.3} {\meter\per\second}.
%    \changes{v0.05 Beta 1}{1999/02/02}{{\tt unit} command changed, thanks to Nancy Winfree}
%    \changes{v0.06 Beta 1}{1999/04/01}{{\tt unit} command changed back to v0.04 version, thanks to J\"{u}rgen von Hagen}
%    \begin{macrocode}
\newcommand*{\unit}[2]{\ensuremath{\mathrm{#1\qsk#2}}}
%    \end{macrocode}
%    \changes{v0.03 Beta  3}{1998/11/04}{{\tt unit} command changed}
%    \changes{v0.03 Beta  2}{1998/10/30}{{\tt unit} command added}
%    \subsection{Power(full) macros}
%    \DescribeMacro{\power}
%    The |\power|\footnotemark[1]\footnotetext{Thanks to Werenfried Spit  --- (|w.spit@WITBO.NL|)}macro is used to typeset a superscript. Usage:
%    \verb=\power{\metre}{2}= to get: m\(^{2}\)
%    \begin{macrocode}
\newcommand*{\power}[2]{\ensuremath{\mathrm{#1}^{#2}}}
%    \end{macrocode}
%   \changes{v0.06 Beta 2}{1999/04/06}{amssymb compatibility}
%   \subsection{Handling options to prevent conflicts}
%    \begin{macrocode}
\AtBeginDocument{%
 \ifredefsquare
  \providecommand{\square}[1]{\power{#1}{2}}
  \renewcommand{\square}[1]{\power{#1}{2}}
  \typeout{Option `amssymb' provided! ^^JCommand `square' redefined by SIunits package!}
  \typeout{}
 \else
   \ifdefsquaren
    \providecommand{\squaren}[1]{\power{#1}{2}}
    \renewcommand{\squaren}[1]{\power{#1}{2}}
    \typeout{Option `squaren' provided! ^^JCommand `squaren' defined by SIunits package!}
    \typeout{}
   \else
    \@ifundefined{square}{%
     \newcommand*{\square}[1]{\power{#1}{2}}
     }{%
     \PackageWarningNoLine{SIunits}{%
     The command `square' was already defined.\MessageBreak
     Possibly due to the amssymb package}
     \typeout{Hint: use option `amssymb' or `squaren' with SIunits package.}
     \typeout{See SIunits.dvi or readme.txt section: Known problems and limitations.}
     \typeout{}
    }  %\ifundefined{square}
   \fi %\ifsefsquaren
 \fi   %\ifredefsquare
 }     %\AtBeginDocument
%    \end{macrocode}
%    \DescribeMacro{\squared}
%    \DescribeMacro{\cubic}
%    \DescribeMacro{\cubed}
%    \DescribeMacro{\fourth}
%    The above example can be realised in a more intuitive way: \verb=\square\metre=: m\(^{2}\).
%    The same goes for |\cubic| \& |\fourth|: m\(^{3}\) \& m\(^{4}\).
%    \begin{macrocode}
\newcommand*{\squared}{\ensuremath{^{\mathrm{2}}}}
\newcommand*{\cubic}[1]{\power{#1}{3}}
\newcommand*{\cubed}{\ensuremath{^{\mathrm{3}}}}
\newcommand*{\fourth}[1]{\power{#1}{4}}
%    \end{macrocode}
%    \DescribeMacro{\reciprocal}
%    \DescribeMacro{\rp}
%    \DescribeMacro{\rpsquare}
%    \DescribeMacro{\rpsquared}
%    \DescribeMacro{\rpcubic}
%    \DescribeMacro{\rpcubed}
%    \DescribeMacro{\rpfourth}
%    The macros |\reciprocal|, |\rpsquare|, |\rpsquared|, |\rpcubic|, |\rpcubed| and |\rpfourth| provide the reciprocal (negative power): e.\,g.
%    m\(^{-1}\), m\(^{-2}\), m\(^{-3}\) and m\(^{-4}\). |\rp| is a short form for |\reciprocal|.
%    \begin{macrocode}
\newcommand*{\reciprocal}[1]{\power{#1}{-1}}
\newcommand{\rp}{\reciprocal}
\newcommand*{\rpsquare}[1]{\power{#1}{-2}}
\newcommand*{\rpsquared}{\ensuremath{^{\mathrm{-2}}}}
\newcommand*{\rpcubic}[1]{\power{#1}{-3}}
\newcommand*{\rpcubed}{\ensuremath{^{\mathrm{-3}}}}
\newcommand*{\rpfourth}[1]{\power{#1}{-4}}
%    \end{macrocode}
%    \subsection{SI decimal \textit{prefixes}}
%    \DescribeMacro{Prefixes}
%    These prefixes may be used to construct decimal fractions or multiples of units. Two
%    different forms are provided, e.\,g. \verb=\milli= and \verb=\millid=.
%    \subsubsection{Symbols}
%    \DescribeMacro{symbols}
%    The first form gives the symbol of the prefix: \verb=\milli\second=: ms;
%
%    \begin{macrocode}
\newcommand{\yocto}{\ensuremath{\mathrm{y}}}
\newcommand{\zepto}{\ensuremath{\mathrm{z}}}
\newcommand{\atto}{\ensuremath{\mathrm{a}}}
\newcommand{\femto}{\ensuremath{\mathrm{f}}}
\newcommand{\pico}{\ensuremath{\mathrm{p}}}
\newcommand{\nano}{\ensuremath{\mathrm{n}}}
\newcommand{\micro}{\ensuremath{\mathrm{\upmu}}}
\newcommand{\milli}{\ensuremath{\mathrm{m}}}
\newcommand{\centi}{\ensuremath{\mathrm{c}}}
\newcommand{\deci}{\ensuremath{\mathrm{d}}}
\newcommand{\deca}{\ensuremath{\mathrm{da}}}
\newcommand{\hecto}{\ensuremath{\mathrm{h}}}
\newcommand{\kilo}{\ensuremath{\mathrm{k}}}
\newcommand{\mega}{\ensuremath{\mathrm{M}}}
\newcommand{\giga}{\ensuremath{\mathrm{G}}}
\newcommand{\tera}{\ensuremath{\mathrm{T}}}
\newcommand{\peta}{\ensuremath{\mathrm{P}}}
\newcommand{\exa}{\ensuremath{\mathrm{E}}}
\newcommand{\zetta}{\ensuremath{\mathrm{Z}}}
\newcommand{\yotta}{\ensuremath{\mathrm{Y}}}
%    \end{macrocode}
%    \subsubsection{Decimal form}
%    \DescribeMacro{decimals}
%    The other form gives the \textbf{d}ecimal factor: \verb=\kilod\usk\hertz=:
%    \(10^{3}\,\mathrm{Hz}\)
%
%    \begin{macrocode}
\newcommand{\yoctod}{\power{10}{-24}}
\newcommand{\zeptod}{\power{10}{-21}}
\newcommand{\attod}{\power{10}{-18}}
\newcommand{\femtod}{\power{10}{-15}}
\newcommand{\picod}{\power{10}{-12}}
\newcommand{\nanod}{\power{10}{-9}}
\newcommand{\microd}{\power{10}{-6}}
\newcommand{\millid}{\power{10}{-3}}
\newcommand{\centid}{\power{10}{-2}}
\newcommand{\decid}{\power{10}{-1}}
\newcommand{\decad}{\power{10}{1}}
\newcommand{\hectod}{\power{10}{2}}
\newcommand{\kilod}{\power{10}{3}}
\newcommand{\megad}{\power{10}{6}}
\newcommand{\gigad}{\power{10}{9}}
\newcommand{\terad}{\power{10}{12}}
\newcommand{\petad}{\power{10}{15}}
\newcommand{\exad}{\power{10}{18}}
\newcommand{\zettad}{\power{10}{21}}
\newcommand{\yottad}{\power{10}{24}}
%    \end{macrocode}
%    \subsubsection*{The SI exception}
%    \DescribeMacro{\gram}
%    In the SI, {\it Base} units, {\it Supplementary} units and {\it Derived} units do not have
%    prefixes, except for the \textit{base} unit of mass: \textit{kilo}gram, not: gram. However,
% the macro |\gram| provides the symbol of gram: \(\mathrm{g}\).
%
%    \begin{macrocode}
\newcommand{\gram}{\ensuremath{\mathrm{g}}}
%    \end{macrocode}
%    \subsection{SI \textit{base} units}
%    \DescribeMacro{\metre}
%    \DescribeMacro{\meter}
%    length: metre --- \(\mathrm{m}\) \\
%    Both |\metre| and |\meter| can be used.
%
%    \begin{macrocode}
\newcommand{\metre}{\ensuremath{\mathrm{m}}}
%    \end{macrocode}
%    \DescribeMacro{\kilogram}
%    mass: kilogram --- \(\mathrm{kg}\)
%
%    \begin{macrocode}
\newcommand{\kilogram}{\kilo\gram}
%    \end{macrocode}
%    \DescribeMacro{\second}
%    time: second --- \(\mathrm{s}\)
%
%    \begin{macrocode}
\newcommand{\second}{\ensuremath{\mathrm{s}}}
%    \end{macrocode}
%    \DescribeMacro{\ampere}
%    electric current: ampere --- \(\mathrm{A}\)
%
%    \begin{macrocode}
\newcommand{\ampere}{\ensuremath{\mathrm{A}}}
%    \end{macrocode}
%    \DescribeMacro{\kelvin}
%    thermodynamic temperature: kelvin --- \(\mathrm{K}\)
%
%    \begin{macrocode}
\newcommand{\kelvin}{\ensuremath{\mathrm{K}}}
%    \end{macrocode}
%    \DescribeMacro{\mole}
%    amount of substance: mole --- {\(\mathrm{mol}\)}
%
%    \begin{macrocode}
\newcommand{\mole}{\ensuremath{\mathrm{mol}}}
%    \end{macrocode}
%    \DescribeMacro{\candela}
%    luminous intensity: candela --- {\(\mathrm{cd}\)}
%
%    \begin{macrocode}
\newcommand{\candela}{\ensuremath{\mathrm{cd}}}
%    \end{macrocode}
%
%    \subsection{SI \textit{derived} units}
%    \DescribeMacro{\radian}
%    plane angle
%
%    \begin{macrocode}
\newcommand{\radian}{\ensuremath{\mathrm{rad}}}
%    \end{macrocode}
%    \DescribeMacro{\steradian}
%    {solid angle}
%
%    \begin{macrocode}
\newcommand{\steradian}{\ensuremath{\mathrm{sr}}}
%    \end{macrocode}
%    \DescribeMacro{\hertz}
%    {frequency}
%
%    \begin{macrocode}
\newcommand{\hertz}{\ensuremath{\mathrm{Hz}}}
%    \end{macrocode}
%    \DescribeMacro{\newton}
%    {force}
%
%    \begin{macrocode}
\newcommand{\newton}{\ensuremath{\mathrm{N}}}
%    \end{macrocode}
%    \DescribeMacro{\pascal}
%    {pressure}
%
%    \begin{macrocode}
\newcommand{\pascal}{\ensuremath{\mathrm{Pa}}}
%    \end{macrocode}
%    \DescribeMacro{\joule}
%    {energy, work, quantity of heat}
%
%    \begin{macrocode}
\newcommand{\joule}{\ensuremath{\mathrm{J}}}
%    \end{macrocode}
%    \DescribeMacro{\watt}
%    {power, radiant flux}
%
%    \begin{macrocode}
\newcommand{\watt}{\ensuremath{\mathrm{W}}}
%    \end{macrocode}
%    \DescribeMacro{\coulomb}
%    {electric charge, quantity of electricity}
%
%    \begin{macrocode}
\newcommand{\coulomb}{\ensuremath{\mathrm{C}}}
%    \end{macrocode}
%    \DescribeMacro{\volt}
%    {electrical potential, potential difference, electromotive force}
%
%    \begin{macrocode}
\newcommand{\volt}{\ensuremath{\mathrm{V}}}
%    \end{macrocode}
%    \DescribeMacro{\farad}
%    {capacitance}
%
%    \begin{macrocode}
\newcommand{\farad}{\ensuremath{\mathrm{F}}}
%    \end{macrocode}
%    \DescribeMacro{\ohm}
%    {electrical resistance}
%    \changes{v0.04}{1999/01/22}{{\tt Ohm} definition changed (thanks to Juergen von Haegen)}
%    \begin{macrocode}
\newcommand{\ohm}{\ensuremath{\mathrm{\Omega}}}
%    \end{macrocode}
%    \DescribeMacro{\siemens}
%    {electrical conductance}
%
%    \begin{macrocode}
\newcommand{\siemens}{\ensuremath{\mathrm{S}}}
%    \end{macrocode}
%    \DescribeMacro{\weber}
%    {magnetic flux, magnetic field strength}
%
%    \begin{macrocode}
\newcommand{\weber}{\ensuremath{\mathrm{Wb}}}
%    \end{macrocode}
%    \DescribeMacro{\tesla}
%    {magnetic flux density}
%
%    \begin{macrocode}
\newcommand{\tesla}{\ensuremath{\mathrm{T}}}
%    \end{macrocode}
%    \DescribeMacro{\henry}
%    {inductance}
%
%    \begin{macrocode}
\newcommand{\henry}{\ensuremath{\mathrm{H}}}
%    \end{macrocode}
%    \DescribeMacro{\degreecelsius}
%    \DescribeMacro{\celsius}
%    {Celsius temperature unit name : ``degree Celsius''\\ both
%    |\degreecelsius| and |\celsius| can be used.}
%
%    \begin{macrocode}
\newcommand{\degreecelsius}{\degree\Celsius}
\newcommand{\celsius}{\degreecelsius}
%    \end{macrocode}
%    \DescribeMacro{\lumen}
%    {luminous flux}
%
%    \begin{macrocode}
\newcommand{\lumen}{\ensuremath{\mathrm{lm}}}
%    \end{macrocode}
%    \DescribeMacro{\lux}
%    {illuminance}
%    \changes{v0.03 Beta  1}{1998/10/23}{{\tt lux} unit corrected: lx }
%    \begin{macrocode}
\newcommand{\lux}{\ensuremath{\mathrm{lx}}}
%    \end{macrocode}
%    \DescribeMacro{\becquerel}
%    {activity of a radionuclide}
%
%    \begin{macrocode}
\newcommand{\becquerel}{\ensuremath{\mathrm{Bq}}}
%    \end{macrocode}
%    \DescribeMacro{\gray}
%    {absorbed dose, specific energy imparted, kerma}
%
%    \begin{macrocode}
\newcommand{\gray}{\ensuremath{\mathrm{Gy}}}
%    \end{macrocode}
%    \DescribeMacro{\sievert}
%    {dose equivalent}
%
%    \begin{macrocode}
\newcommand{\sievert}{\ensuremath{\mathrm{Sv}}}
%    \end{macrocode}
%    \subsubsection{The \opt{derivedinbase} mode}
%    \subsection*{Expression of derived SI units in SI base units}
%    \DescribeMacro{\SIunits@opt@derivedinbase}
%    This macro provides the expression of derived SI units in SI base units.
%    These macros can be accessed by putting `base' behind the SI derived unit command,
%    e.\,g. (\verb=\pascalbase=) to get '\pascalbase`.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@derivedinbase{%
\newcommand{\radianbase}{\metre\usk\reciprocal\metre}
\newcommand{\steradianbase}{\square\metre\usk\rpsquare\metre}
\newcommand{\hertzbase}{\reciprocal\second}
\newcommand{\newtonbase}{\metre\usk\kilogram\usk\second\rpsquared}
\newcommand{\pascalbase}{\reciprocal\metre\usk\kilogram\usk\second\rpsquared}
\newcommand{\joulebase}{\square\metre\usk\kilogram\usk\second\rpsquared}
\newcommand{\wattbase}{\square\metre\usk\kilogram\usk\rpcubic\second}
\newcommand{\coulombbase}{\second\usk\ampere}
\newcommand{\voltbase}{\square\metre\usk\kilogram\usk\rpcubic\second\usk\reciprocal\ampere}
\newcommand{\faradbase}{\rpsquare\metre\usk\reciprocal\kilogram\usk\fourth\second\usk\ampere\squared}
\newcommand{\ohmbase}{\square\metre\usk\kilogram\usk\rpcubic\second\usk\rpsquare\ampere}
\newcommand{\siemensbase}{\rpsquare\metre\usk\reciprocal\kilogram\usk\cubic\second\usk\ampere\squared}
\newcommand{\weberbase}{\square\metre\usk\kilogram\usk\second\rpsquared\usk\reciprocal\ampere}
\newcommand{\teslabase}{\kilogram\usk\second\rpsquared\usk\reciprocal\ampere}
\newcommand{\henrybase}{\square\metre\usk\kilogram\usk\second\rpsquared\usk\rpsquare\ampere}
\newcommand{\celsiusbase}{\kelvin}
\newcommand{\lumenbase}{\candela\usk\square\metre\usk\rpsquare\metre}
\newcommand{\luxbase}{\candela\usk\square\metre\usk\rpfourth\metre}
\newcommand{\becquerelbase}{\hertzbase}
\newcommand{\graybase}{\square\metre\usk\second\rpsquared}
\newcommand{\sievertbase}{\graybase}
      \typeout{Option 'derivedinbase' provided!^^J}}
%    \end{macrocode}
%    \subsubsection{The \opt{derived} mode}
%    \subsection*{Expression of derived SI units in other derived SI units}
%    \DescribeMacro{\SIunits@opt@derived}
%    This macro provides the expression of derived SI units in other SI derived units (if possible).
%    These macros can be accessed by putting `der' in front of the SI derived unit command,
%    e.\,g. (\verb=\derpascal=) to get '\derpascal`.
%
%    \begin{macrocode}
\newcommand*\SIunits@opt@derived{%
\newcommand{\derradian}{\metre\usk\reciprocal\metre}
\newcommand{\dersteradian}{\square\metre\usk\rpsquare\metre}
\newcommand{\derhertz}{\reciprocal\second}
\newcommand{\dernewton}{\metre\usk\kilogram\usk\second\rpsquared}
\newcommand{\derpascal}{\newton\usk\rpsquare\metre}
\newcommand{\derjoule}{\newton\usk\metre}
\newcommand{\derwatt}{\joule\usk\reciprocal\second}
\newcommand{\dercoulomb}{\ampere\usk\second}
\newcommand{\dervolt}{\watt\usk\reciprocal\ampere}
\newcommand{\derfarad}{\coulomb\usk\reciprocal\volt}
\newcommand{\derohm}{\volt\usk\reciprocal\ampere}
\newcommand{\dersiemens}{\ampere\usk\reciprocal\volt}
\newcommand{\derweber}{\square\metre\usk\kilogram\usk\second\rpsquared\usk\reciprocal\ampere}
\newcommand{\dertesla}{\weber\usk\rpsquare\metre}
\newcommand{\derhenry}{\weber\usk\reciprocal\ampere}
\newcommand{\dercelsius}{\kelvin}
\newcommand{\derlumen}{\candela\usk\steradian}
\newcommand{\derlux}{\lumen\usk\rpsquare\metre}
\newcommand{\derbecquerel}{\derhertz}
\newcommand{\dergray}{\joule\usk\reciprocal\kilogram}
\newcommand{\dersievert}{\dergray}
     \typeout{Option `derived' provided! ^^J}}
%    \end{macrocode}
%    \subsection{Units that are used with the SI}
%    \DescribeMacro{\minute}
%    \DescribeMacro{\hour}
%    \DescribeMacro{\dday}
%    Time: |\day| was already used
%
%    \begin{macrocode}
\newcommand{\minute}{\ensuremath{\mathrm{min}}}
\newcommand{\hour}{\ensuremath{\mathrm{h}}}
\newcommand{\dday}{\ensuremath{\mathrm{d}}}
%    \end{macrocode}
%    \DescribeMacro{\degree}
%    \DescribeMacro{\paminute}
%    \DescribeMacro{\pasecond}
%    Plane angle: |\minute| and |\second| were already used
%
%    \begin{macrocode}
\newcommand{\degree}{\ensuremath{^{\circ}}}
\newcommand{\paminute}{\ensuremath{'}}
\newcommand{\pasecond}{\ensuremath{''}}
%    \end{macrocode}
%    \DescribeMacro{\ton}
%    \DescribeMacro{\tonne}
%    Mass: metric ton or tonne
%
%    \begin{macrocode}
\newcommand{\ton}{\ensuremath{\mathrm{t}}}
\newcommand{\tonne}{\ensuremath{\mathrm{t}}}
%    \end{macrocode}
%    \DescribeMacro{\liter}
%    \DescribeMacro{\litre}
%    Volume: litre or liter
%
%    \begin{macrocode}
\newcommand{\liter}{\ensuremath{\mathrm{L}}}
\newcommand{\litre}{\ensuremath{\mathrm{l}}}
%    \end{macrocode}
%    \DescribeMacro{\curie}
%    Radioactivity
%
%    \begin{macrocode}
\newcommand{\curie}{\ensuremath{\mathrm{Ci}}}
%    \end{macrocode}
%    \DescribeMacro{\rad}
%    \DescribeMacro{\arad}
%    Absorbed dose: rad. When there is risk of confusion with the symbol for radian (\radian), \arad\ may be used as the symbol for rad.
%
%    \begin{macrocode}
\newcommand{\rad}{\ensuremath{\mathrm{rad}}}
\newcommand{\arad}{\ensuremath{\mathrm{rd}}}
%    \end{macrocode}
%    \DescribeMacro{\rem}
%    Dose equivalent
%
%    \begin{macrocode}
\newcommand{\rem}{\ensuremath{\mathrm{rem}}}
%    \end{macrocode}
%    \DescribeMacro{\roentgen}
%    Exposure
%
%    \begin{macrocode}
\newcommand{\roentgen}{\ensuremath{\mathrm{R}}}
%    \end{macrocode}
%    \DescribeMacro{\electronvolt}
%    Energy
%
%    \begin{macrocode}
\newcommand{\electronvolt}{\ensuremath{\mathrm{e}\volt}}
%    \end{macrocode}
%    \DescribeMacro{\atomicmass}
%    Unified atomic mass unit
%
%    \begin{macrocode}
\newcommand{\atomicmass}{\ensuremath{\mathrm{u}}}
%    \end{macrocode}
%    \DescribeMacro{\are}
%    \DescribeMacro{\hectare}
%    \DescribeMacro{\barn}
%    Area
%
%    \begin{macrocode}
\newcommand{\are}{\ensuremath{\mathrm{a}}}
\newcommand{\hectare}{\ensuremath{\mathrm{ha}}}
\newcommand{\barn}{\ensuremath{\mathrm{b}}}
%    \end{macrocode}
%    \DescribeMacro{\bbar}
%    Pressure
%
%    \begin{macrocode}
\newcommand{\bbar}{\ensuremath{\mathrm{bar}}}
%    \end{macrocode}
%    \DescribeMacro{\gal}
%    Acceleration
%
%    \begin{macrocode}
\newcommand{\gal}{\ensuremath{\mathrm{Gal}}}
%    \end{macrocode}
%    \DescribeMacro{\angstrom}
%    Length
%    \changes{v0.02 Beta  7}{1998/10/01}{{\tt angstrom} changed; thanks to Lutz Schwalowsky}
%
%    \begin{macrocode}
\newcommand{\angstrom}{\mbox{\textrm{\AA}}}
%    \end{macrocode}
%    \DescribeMacro{\rperminute}
%    Rotational frequency: revolutions per minute
%
%    \begin{macrocode}
\newcommand{\rperminute}{\ensuremath{\mathrm{r}\per\minute}}
%    \end{macrocode}
%
%    \subsection{SI units with compound names}
%    \DescribeMacro{\squaremetre}
%    Area
%
%    \begin{macrocode}
\newcommand{\squaremetre}{\square\metre}
%    \end{macrocode}
%    \DescribeMacro{\cubicmetre}
%    Volume
%
%    \begin{macrocode}
\newcommand{\cubicmetre}{\cubic\metre}
%    \end{macrocode}
%    \subsection{Various ready-to-use units}
%    These units are provided for the ease of the users of the \ttSIunits\ package. Normally, two
%    forms of the units are provided, e.\,g. |\graypersecond| and |\graypersecondnp|. The
%    |command|{\sf np} form uses negative powers instead of /: `\graypersecond' and
% ` \graypersecondnp'.\\
%    \changes{v0.02 Beta  3}{1998/09/11}{{\tt pH} command removed (not in SI)}
%%    absorbed dose rate
%    \begin{macrocode}
\newcommand{\graypersecond}{\gray\per\second}
\newcommand{\graypersecondnp}{\gray\usk\reciprocal\second}
%    \end{macrocode}
%%    acceleration
%    \begin{macrocode}
\newcommand{\metrepersquaresecond}{\metre\per\second\squared}
\newcommand{\metrepersquaresecondnp}{\metre\usk\second\rpsquared}
%    \end{macrocode}
%%    activation energy,   molar energy
%    \begin{macrocode}
\newcommand{\joulepermole}{\joule\per\mole}
\newcommand{\joulepermolenp}{\joule\usk\reciprocal\mole}
%    \end{macrocode}
%%   amount-of-substance concentration
%    \begin{macrocode}
\newcommand{\molepercubicmetre}{\mole\per\cubic\metre}
\newcommand{\molepercubicmetrenp}{\mole\usk\rpcubic\metre}
%    \end{macrocode}
%%    angular acceleration
%    \begin{macrocode}
\newcommand{\radianpersquaresecond}{\radian\per\second\squared}
\newcommand{\radianpersquaresecondnp}{\radian\usk\second\rpsquared}
%    \end{macrocode}
%%    angular momentum
%    \begin{macrocode}
\newcommand{\kilogramsquaremetrepersecond}{\kilogram\usk\square\metre\per\second}
\newcommand{\kilogramsquaremetrepersecondnp}{\kilogram\usk\square\metre\usk\reciprocal\second}
%    \end{macrocode}
%%    angular velocity
%    \begin{macrocode}
\newcommand{\radianpersecond}{\radian\per\second}
\newcommand{\radianpersecondnp}{\radian\usk\reciprocal\second}
%    \end{macrocode}
%%    area per unit volume
%    \begin{macrocode}
\newcommand{\squaremetrepercubicmetre}{\square\metre\per\cubic\metre}
\newcommand{\squaremetrepercubicmetrenp}{\square\metre\usk\rpcubic\metre}
%    \end{macrocode}
%%    charge per mole
%    \begin{macrocode}
\newcommand{\coulombpermol}{\coulomb\per\mole}
\newcommand{\coulombpermolnp}{\coulomb\usk\reciprocal\mole}
%    \end{macrocode}
%%    current density
%    \begin{macrocode}
\newcommand{\amperepersquaremetre}{\ampere\per\square\metre}
\newcommand{\amperepersquaremetrenp}{\ampere\usk\rpsquare\metre}
%    \end{macrocode}
%%    density
%    \begin{macrocode}
\newcommand{\kilogrampercubicmetre}{\kilogram\per\cubic\metre}
\newcommand{\kilogrampercubicmetrenp}{\kilogram\usk\rpcubic\metre}
%    \end{macrocode}
%%    dynamic fluidity (1/viscosity)
%    \begin{macrocode}
\newcommand{\squaremetrepernewtonsecond}{\square\metre\per\newton\usk\second}
\newcommand{\squaremetrepernewtonsecondnp}{\square\metre\usk\reciprocal\newton\usk\reciprocal\second}
%    \end{macrocode}
%%    dynamic viscosity
%    \begin{macrocode}
\newcommand{\pascalsecond}{\pascal\usk\second}
%    \end{macrocode}
%%   electric charge density
%    \begin{macrocode}
\newcommand{\coulombpercubicmetre}{\coulomb\per\cubic\metre}
\newcommand{\coulombpercubicmetrenp}{\coulomb\usk\rpcubic\metre}
%    \end{macrocode}
%%    electric dipole moment
%    \begin{macrocode}
\newcommand{\amperemetresecond}{\ampere\usk\metre\usk\second} %    \end{macrocode}
%%    electric field strength
%    \begin{macrocode}
\newcommand{\voltpermetre}{\volt\per\metre}
\newcommand{\voltpermetrenp}{\volt\usk\reciprocal\metre}
%    \end{macrocode}
%%   electric flux density
%    \begin{macrocode}
\newcommand{\coulombpersquaremetre}{\coulomb\per\square\metre}
\newcommand{\coulombpersquaremetrenp}{\coulomb\usk\rpsquare\metre}
%    \end{macrocode}
%%    electrical permittivity
%    \begin{macrocode}
\newcommand{\faradpermetre}{\farad\per\metre}
\newcommand{\faradpermetrenp}{\farad\usk\reciprocal\metre}
%    \end{macrocode}
%%    electrical resistivity
%    \begin{macrocode}
\newcommand{\ohmmetre}{\ohm\usk\metre}
%    \end{macrocode}
%%    energy
%    \begin{macrocode}
\newcommand{\kilowatthour}{\kilo\watt\hour}
%    \end{macrocode}
%%    energy flux
%    \begin{macrocode}
\newcommand{\wattpersquaremetre}{\watt\per\square\metre}
\newcommand{\wattpersquaremetrenp}{\watt\usk\rpsquare\metre}
%    \end{macrocode}
%%    energy per unit area
%    \begin{macrocode}
\newcommand{\joulepersquaremetre}{\joule\per\square\metre}
\newcommand{\joulepersquaremetrenp}{\joule\usk\rpsquare\metre}
%    \end{macrocode}
%%    force (body)
%    \begin{macrocode}
\newcommand{\newtonpercubicmetre}{\newton\per\cubic\metre}
\newcommand{\newtonpercubicmetrenp}{\newton\usk\rpcubic\metre}
%    \end{macrocode}
%%    force per unit mass
%    \begin{macrocode}
\newcommand{\newtonperkilogram}{\newton\per\kilogram}
\newcommand{\newtonperkilogramnp}{\newton\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    heat capacity, entropy
%    \begin{macrocode}
\newcommand{\jouleperkelvin}{\joule\per\kelvin}
\newcommand{\jouleperkelvinnp}{\joule\usk\reciprocal\kelvin}
%    \end{macrocode}
%%    heat of combustion, fusion or vaporisation
%    \begin{macrocode}
\newcommand{\jouleperkilogram}{\joule\per\kilogram}
\newcommand{\jouleperkilogramnp}{\joule\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    intensity of ionising radiation
%    \begin{macrocode}
\newcommand{\coulombperkilogram}{\coulomb\per\kilogram}
\newcommand{\coulombperkilogramnp}{\coulomb\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    kinematic viscosity
%    \begin{macrocode}
\newcommand{\squaremetrepersecond}{\squaremetre\per\second}
\newcommand{\squaremetrepersecondnp}{\squaremetre\usk\reciprocal\second}
%    \end{macrocode}
%%    kinematic energy of turbulence
%    \begin{macrocode}
\newcommand{\squaremetrepersquaresecond}{\square\metre\per\second\squared}
\newcommand{\squaremetrepersquaresecondnp}{\square\metre\usk\second\rpsquared}
%    \end{macrocode}
%%    linear momentum
%    \begin{macrocode}
\newcommand{\kilogrammetrepersecond}{\kilogram\usk\metre\per\second}
\newcommand{\kilogrammetrepersecondnp}{\kilogram\usk\metre\usk\reciprocal\second}
%    \end{macrocode}
%%    luminance
%    \begin{macrocode}
\newcommand{\candelapersquaremetre}{\candela\per\square\metre}
\newcommand{\candelapersquaremetrenp}{\candela\usk\rpsquare\metre}
%    \end{macrocode}
%%    magnetic field strength
%    \begin{macrocode}
\newcommand{\amperepermetre}{\ampere\per\metre}
\newcommand{\amperepermetrenp}{\ampere\usk\reciprocal\metre}
%    \end{macrocode}
%%    magnetic moment
%    \begin{macrocode}
\newcommand{\joulepertesla}{\joule\per\tesla}
\newcommand{\jouleperteslanp}{\joule\usk\reciprocal\tesla}
%    \end{macrocode}
%%    magnetic permeability
%    \begin{macrocode}
\newcommand{\henrypermetre}{\henry\per\metre}
\newcommand{\henrypermetrenp}{\henry\usk\reciprocal\metre}
%    \end{macrocode}
%%    mass flow rate
%    \begin{macrocode}
\newcommand{\kilogrampersecond}{\kilogram\per\second}
\newcommand{\kilogrampersecondnp}{\kilogram\usk\reciprocal\second}
%    \end{macrocode}
%%    mass flux
%    \begin{macrocode}
\newcommand{\kilogrampersquaremetresecond}{\kilogram\per\square\metre\usk\second}
\newcommand{\kilogrampersquaremetresecondnp}{\kilogram\usk\rpsquare\metre\usk\reciprocal\second}
%    \end{macrocode}
%%    mass per unit area
%    \begin{macrocode}
\newcommand{\kilogrampersquaremetre}{\kilogram\per\square\metre}
\newcommand{\kilogrampersquaremetrenp}{\kilogram\usk\rpsquare\metre}
%    \end{macrocode}
%%    mass per unit length
%    \begin{macrocode}
\newcommand{\kilogrampermetre}{\kilogram\per\metre}
\newcommand{\kilogrampermetrenp}{\kilogram\usk\reciprocal\metre}
%    \end{macrocode}
%%    molar heat capacity, molar entropy
%    \begin{macrocode}
\newcommand{\joulepermolekelvin}{\joule\per\mole\usk\kelvin}
\newcommand{\joulepermolekelvinnp}{\joule\usk\reciprocal\mole\usk\reciprocal\kelvin}
%    \end{macrocode}
%%    molecular weight
%    \begin{macrocode}
\newcommand{\kilogramperkilomole}{\kilogram\per\kilo\mole}
\newcommand{\kilogramperkilomolenp}{\kilogram\usk\kilo\reciprocal\mole}
%    \end{macrocode}
%%    moment of inertia
%    \begin{macrocode}
\newcommand{\kilogramsquaremetre}{\kilogram\usk\square\metre}
\newcommand{\kilogramsquaremetrenp}{\kilogramsquaremetre}
%    \end{macrocode}
%%    momentum flow rate
%    \begin{macrocode}
\newcommand{\kilogrammetrepersquaresecond}{\kilogram\usk\metre\per\second\squared}
\newcommand{\kilogrammetrepersquaresecondnp}{\kilogram\usk\metre\usk\second\rpsquared}
%    \end{macrocode}
%%    momentum flux
%    \begin{macrocode}
\newcommand{\newtonpersquaremetre}{\newton\per\square\metre}
\newcommand{\newtonpersquaremetrenp}{\newton\usk\rpsquare\metre}
%    \end{macrocode}
%%    photon emission rate
%    \begin{macrocode}
\newcommand{\persquaremetresecond}{1\per\square\metre\usk\second}
\newcommand{\persquaremetresecondnp}{\rpsquare\metre\usk\reciprocal\second}
%    \end{macrocode}
%%    power per unit mass
%    \begin{macrocode}
\newcommand{\wattperkilogram}{\watt\per\kilogram}
\newcommand{\wattperkilogramnp}{\watt\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    power per unit volume
%    \begin{macrocode}
\newcommand{\wattpercubicmetre}{\watt\per\cubic\metre}
\newcommand{\wattpercubicmetrenp}{\watt\usk\rpcubic\metre}
%    \end{macrocode}
%%  radiance
%    \begin{macrocode}
\newcommand{\wattpersquaremetresteradian}{\watt\per\squaremetre\usk\steradian}
\newcommand{\wattpersquaremetresteradiannp}{\watt\usk\rpsquare\metre\usk\rp\steradian}
%    \end{macrocode}
%%    specific heat capacity
%    \begin{macrocode}
\newcommand{\jouleperkilogramkelvin}{\joule\per\kilogram\usk\kelvin}
\newcommand{\jouleperkilogramkelvinnp}{\joule\usk\reciprocal\kilogram\usk\reciprocal\kelvin}
%    \end{macrocode}
%%    specific surface
%    \begin{macrocode}
\newcommand{\squaremetreperkilogram}{\square\metre\per\kilogram}
\newcommand{\rpsquaremetreperkilogram}{\square\metre\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    specific volume
%    \begin{macrocode}
\newcommand{\cubicmetreperkilogram}{\cubic\metre\per\kilogram}
\newcommand{\rpcubicmetreperkilogram}{\cubic\metre\usk\reciprocal\kilogram}
%    \end{macrocode}
%%    surface tension
%    \begin{macrocode}
\newcommand{\newtonpermetre}{\newton\per\metre}
\newcommand{\newtonpermetrenp}{\newton\usk\reciprocal\metre}
%    \end{macrocode}
%%    derived SI unit: \degreecelsius
%    \begin{macrocode}
\newcommand{\Celsius}{\ensuremath{\mathrm{C}}}
%    \end{macrocode}
%%    thermal conductivity
%    \begin{macrocode}
\newcommand{\wattpermetrekelvin}{\watt\per\metre\usk\kelvin}
\newcommand{\wattpermetrekelvinnp}{\watt\usk\reciprocal\metre\usk\reciprocal\kelvin}
%    \end{macrocode}
%%    torque
%    \begin{macrocode}
\newcommand{\newtonmetre}{\newton\usk\metre}
\newcommand{\newtonmetrenp}{\newtonmetre}
%    \end{macrocode}
%%    turbulence energy dissipation rate
%    \begin{macrocode}
\newcommand{\squaremetrepercubicsecond}{\square\metre\per\cubic\second}
\newcommand{\squaremetrepercubicsecondnp}{\square\metre\usk\rpcubic\second}
%    \end{macrocode}
%%    velocity
%    \begin{macrocode}
\newcommand{\metrepersecond}{\metre\per\second}
\newcommand{\metrepersecondnp}{\metre\usk\reciprocal\second}
%    \end{macrocode}
%%    volumetric calorific value
%    \begin{macrocode}
\newcommand{\joulepercubicmetre}{\joule\per\cubicmetre}
\newcommand{\joulepercubicmetrenp}{\joule\usk\rpcubic\metre}
%    \end{macrocode}
%%    volumetric coefficient of expansion
%    \begin{macrocode}
\newcommand{\kilogrampercubicmetrecoulomb}{\kilogram\per\cubic\metre\usk\coulomb}
\newcommand{\kilogrampercubicmetrecoulombnp}{\kilogram\usk\rpcubic\metre\usk\reciprocal\coulomb}
%    \end{macrocode}
%%    volumetric flow rate
%    \begin{macrocode}
\newcommand{\cubicmetrepersecond}{\cubicmetre\per\second}
\newcommand{\rpcubicmetrepersecond}{\cubicmetre\usk\reciprocal\second}
%    \end{macrocode}
%%    volumetric mass flow rate
%    \begin{macrocode}
\newcommand{\kilogrampersecondcubicmetre}{\kilogram\per\second\usk\cubicmetre}
\newcommand{\kilogrampersecondcubicmetrenp}{\kilogram\usk\reciprocal\second\usk\rpcubic\metre}
%    \end{macrocode}
%  \subsection{The \ttSIunits{\tt .cfg} file}
%  Load the |SIunits.cfg| file, after redefining |\ExecuteOptions| to |\SIunits@execopt|
%  (we cannot simply use |\ExecuteOptions| to preselect options,
%  because we want to pass them to |\SIunits@execopt|).
%  \changes{v0.03 Beta 5}{1998/12/11}{Load optional configuration file `SIunits.cfg'}
%    \begin{macrocode}
\let\SIunits@origExecuteOptions\ExecuteOptions
\let\ExecuteOptions\SIunits@execopt
\InputIfFileExists{SIunits.cfg}{}{%
\PackageWarningNoLine{SIunits}{%
You have no `SIunits.cfg' file installed.\MessageBreak I will assume you are using
`thickspace' and `thickqspace'} \ExecuteOptions{thickspace,thickqspace}}
\let\ExecuteOptions\SIunits@origExecuteOptions
\ProcessOptions
\endinput
%</package>
%    \end{macrocode}
%
%
%    \Finale                                              M.H.
%
