%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-3-24 on page I-170 in "Quantities".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{siunitx}
%StopShownPreambleCommands

\begin{document}
\qty{1.23}{J.mol^{-1}.K^{-1}}                       \\
\qty{.23e7}{\candela}                               \\
\qty[per-mode = symbol]{1.99}{\per\kilogram}        \\
\qty[per-mode = fraction]{1,345}{\coulomb\per\mole} \\
\qty[parse-numbers = false]{\sqrt{3}}{\metre}
\end{document}