Bold siuntix's function num{} in math environment

Question

I am looking for a way to make the num function displayed in bold when used inside a begin{equation}. Using mathbf and boldmath doesn't work (as boldmath makes the entire equation bold and should be used before instead of inside the environment) and the only thing that does, is using bfseries which of course produces errors in math mode. So how could this work:

usepackage{siunitx}

begin{document}

sisetup{detect-weight=true,detect-inline-weight=math}
    begin{equation}
       V= frac{0,0003257}{150cdot 99,96}= mathbf{num{2.1723e-8}}
    end{equation}

end{document}

Preferably without declaring new commands.

Ulrike Fischer · Accepted Answer

siunitx has never detected mathbf. But you can change the font by setting the math-rm-key:

documentclass[12pt]{scrartcl}
usepackage{siunitx}

begin{document}

begin{equation}
       V= frac{0,0003257}{150cdot 99,96}= num[math-rm=mathbf]{2.1723e-8}
 end{equation}

end{document}

Bold siuntix's function num{} in math environment

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