A physical quantity measuring a change of internal energy $\begin{array}{l}U\end{array}$ with respect to its entropy $\begin{array}{l}S\end{array}$ :

(1)	$\begin{array}{l}\displaystyle T = \left( \frac{\partial U}{\partial S} \right)_{V,N}\end{array}$

with other state variables (volume $\begin{array}{l}V\end{array}$ and number of particles $\begin{array}{l}N\end{array}$ ) being constant.

Symbol	Dimension	SI units	Oil metric units	Oil field units
T	$\begin{array}{l}\Theta\end{array}$	K	°C = K - 273	°F = 9/5 T [°C] + 32

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