# Fundamental Physical Constants in SI Units with siunitx

I would like to write e.g. the Bohr magneton in SI units without writing yJ/T and the nuclear magneton (the following code is inconsistent with siunitx-notation: $\mu_\text{N}\approx \SI{5\times 10^{-27}}{\joule\per\tesla}$), for which exists no SI prefix.

The following MWE provides correct working example (for Bohr magneton):

\documentclass{article}
\usepackage{siunitx}
\begin{document}
Bohr magneton ($\mu_\text{B}\approx \SI{9.27400968}{\yocto\joule\per\tesla}$) and
nuclear magneton ($\mu_\text{B}\approx {5.05078353\times 10^{-27}}~JT^{-1}$)
\end{document}


How can I write the nuclear magneton in the such a SI-form?

• Sorry, but what exactly is your question? – Benedikt Bauer Apr 7 '14 at 12:15
• I think karlkoeller understood my question correctly. – strpeter Apr 7 '14 at 12:22

In siunitx sintax you need to write 5.05078353e-27 to obtain 5.05078353\times 10^{-27}:
\documentclass{article}
Bohr magneton ($\mu_\text{B}\approx \SI{9.27400968}{\yocto\joule\per\tesla}$) and
nuclear magneton ($\mu_\text{B}\approx \SI{5.05078353e-27}{\joule\per\tesla}$)