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I think this is the most recent siunitx' manual. Here the word percent appears only five times, and I cannot find permille or similar. A possible answer can be found here, that is, you can put the following declaration in the preamble \DeclareSIUnit\permille{\text{\textperthousand}} and then use it just as the \percent macro of siunitx. ...


In relation to the last two examples, the units should be shown in square brackets, not parenthesis. This is part of the conventions used in the SI and it was discussed in other articles like Unit column in table with square brackets and siunitx.


The following example uses specialized packages for the different tasks: mhchem for easier input and typesetting of chemical formulas. siunitx for setting units, numbers and numbers with units. There are many configuration options. amsmath for more advanced features in the area of mathematical typesetting. Example: \documentclass{article} ...


I can suggest two ways: \documentclass{article} \usepackage{amsmath} \begin{document} \begin{align} \vec{\nabla} \times \vec{B} &= \mu_0\vec{j} && \textup{(SI units)} \\ \vec{\nabla} \times \vec{B} &= \frac{4\pi}{c}\vec{j} && \textup{(CGS units)} \end{align} \begin{alignat}{2} \vec{\nabla} \times \vec{B} &= ...

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