A pace of thermal energy $\begin{array}{l}E_H\end{array}$ variation (production or consumption) per unit time in a unit volume:

(1)	$\begin{array}{l}\displaystyle q_H = \frac{\delta E_H}{\delta t \, \delta V}\end{array}$

Symbol	Dimension	SI units	Oil metric units	Oil field units
$\begin{array}{l}q_H\end{array}$	M¹L^-1T⁻³	W/m³	W/m³	BTU/(hr⋅ft³)

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