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 · m²)	kg / ( s · m²)	lb / (s · ft²)

Mass Flux vector is proportional to fluid density $\begin{array}{l}\rho\end{array}$ and fluid velocity $\begin{array}{l}\bf u\end{array}$ :

(1)	$\begin{array}{l}\displaystyle {\bf j}_m = \rho \, {\bf u}\end{array}$

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See also