The following code isn't valid but conveys my intention:


as in micro followed by a big M. I don't want to use the explicit form of micro moles per L raised to the negative one in this case.


Joseph Wright just answered a similar question on comp.text.tex:

Take a look at the section 'loading additional units' in the manual. In version 1, I did include \molar and \Molar, but tightened up on sticking to SI units (almost) exclusively for version 2. The suggested definitions are

  • Yes. Using the second definition will then provide a \Molar command that can be used like any other regular SI units. So in your example, you would write \SI{}{\micro\Molar} to get the output you asked for. – Alan Munn Sep 6 '11 at 1:03
  • I tried creating an siunitx.cfg file containing \ProvidesFile{siunitx.cfg} \DeclareSIUnit\Molar{\textsc{m}} in C:\texlive\2010\texmf-dist\tex\latex\siunitx\config and C:\texlive\2010\texmf-dist\tex\latex\siunitx, neither locations worked. Do you know what I'm doing wrong? – ptrcao Sep 6 '11 at 1:25
  • 1
    @ptrcao Take a look at this question: Where do I place my own .sty files. You need to put them in your local texmf folder, not in C:\texlive... – Alan Munn Sep 6 '11 at 2:53
  • @JosephWright when I use the first declare I get mol/d^3m rather than mol/dm^3. I switched it to \DeclareSIUnit\molar{\mole\per\deci\cubic\metre} – Trefex Apr 7 '14 at 14:24
  • @Trefex Sounds like you have something odd in your input: bet to ask a new question with a MWE of what you are doing (or mail me directly: joseph.wright@morningstar2.co.uk). – Joseph Wright Apr 7 '14 at 14:28

According to the siunitx manual (page 14), you can create your own units easily by putting the following command in the preamble:

  • The Molar M should always be small caps! So \DeclareSIUnit{\Molar}{\textsc{m}} is better. It actually is part of siunitx anyways. – basseur Oct 12 '17 at 14:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.