Amount of fluid mass passing through a unit area per unit time:

$\begin{array}{l}\displaystyle j_m = \frac{\delta m}{ \delta A \, \delta t}\end{array}$

where

$\begin{array}{l}\delta m\end{array}$

the amount of mass passed through the area $\begin{array}{l}\delta A\end{array}$ during the time $\begin{array}{l}\delta t\end{array}$

SI unit	Metric unit	Oilfield units
kg / ( s · m³)	kg / ( s · m³)	lb / (s · ft³)

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See also