# Mass Flow Rate

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Mass flow rate is the average velocity of a mass that passes by a point.  It is often abbreviated as the letter m with a dot over it, ṁ. In engineering, mass flow rate is often used, along with the conservation of mass to determine how much product moves through a pipe or duct.  The calculation and formula for determining the mass flow rate where the flow area and density are known.

### Mass Flow Rate formula

$$\large{ \dot m_f = \rho v A }$$

Where:

$$\large{ \dot m_f }$$ = mass flow rate

$$\large{ A }$$ = area of cross section

$$\large{ \rho }$$  (Greek symbol rho) = fluid density

$$\large{ v }$$ = fluid velocity