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Amount of fluid mass passing through a certain area 

LaTeX Math Inline
bodyA
per unit time:

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\dot m_A = \frac{d m}{ d  t} \Big|_A = j_m \cdot A

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Mass flowrate is related to volumetric flowrate  

LaTeX Math Inline
bodyq_A
 and fluid density 
LaTeX Math Inline
body\rho
as:

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\dot m_A = \rho \cdot q_A

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