# How to correctly write units (second, Hertz) in formulae?

I cannot recommend enough the package siunitx in latex for unit and number formatting. What is the method of choice to write and to correct abbreviated units in SE.DSP posts?

I tend to use \mathrm{} macro with a tiny space:
\;\mathrm{Hz}

Another possibility is to use simple \text{} mode instead.
• And what about microhertz? $\;\mathrm{\mu Hz}$? – Laurent Duval May 5 '16 at 14:46