# How can I write the unit Einstein in LaTeX (siunitx)? [duplicate]

I am currently writing my master's thesis with LaTeX and most things really go super good and a lot better than in Word, but I can't seem to get this one working. What I want:

60 yE/m2s (I hope you know what I mean...)


This is what I tried so far:

\SI{60}{\micro\einstein\per\meter\squared\second}


I installed the package correctly as it's working fine with other units like:

\SI{20}{\degreeCelsius}

• Einstein is no SI unit – user31729 May 23 '16 at 12:54
• Isn't y = yokto? Or did you mean to write µ? – cgnieder May 23 '16 at 13:05

Einstein is not among the units available by default in siunitx, but you can declare a new unit.

Note also that you need \per for each unit in the denominator unless you've set sticky-per=true.

\documentclass{article}
\usepackage{siunitx}
\DeclareSIUnit{\einstein}{E}
\begin{document}

\SI{60}{\micro\einstein\per\meter\squared\per\second}

\sisetup{sticky-per=true} %add to preamble for global setting

\SI{60}{\micro\einstein\per\meter\squared\second}
\end{document}

• Note that you don't need one \per per unit if you use the sticky-per option – Jake May 23 '16 at 13:58