[texhax] SIunitx

[Mads Munch Hansen]

Hello, I am having problems with the following bit of code. when I
compile the document, LaTeX complains that \SI is an undefined control
sequence and points to the line above \end{equation*}. I have been
unable to pinpoint the source of the problem, and would be gratefull for
any assistance.

Thanks, Mads

\begin{equation*}
c_\text{Al} = \frac{\SI{0,150}{\kilo\gram}\cdot
\SI{4180}{\joule\per\kilo\gram\per\kelvin} \cdot
(\SI{25,2}{\celsius} - \SI{23,5}{\celsius})} {\SI{0,018}{\kilo\gram})\cdot
(\SI{100}{\celsius} - \SI{25,2}{\celsius})}
\end{equation*}

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