Amount of fluid mass passing through a certain area $\begin{array}{l}A\end{array}$ per unit time:

(1)	$\begin{array}{l}\displaystyle \dot m_A = \frac{d m}{ d t} \Big\|_A = j_m \cdot A\end{array}$

where

$\begin{array}{l}j_m\end{array}$

SI unit	Metric unit	Oilfield units
kg /s	kg /s	lb/s

Mass flowrate is related to volumetric flowrate $\begin{array}{l}q_A\end{array}$ and fluid density $\begin{array}{l}\rho\end{array}$ as:

(2)	$\begin{array}{l}\displaystyle \dot m_A = \rho \cdot q_A\end{array}$

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See also