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Basic Physics
Fluid mechanics
Mass flow rate

11. Fluid mechanics

Mass flow rate

In 11. Fluid mechanics

Formula

\dot m=\rho Q=\rho Av

Tags

physics
fluids
physics formula
mechanics of fluids

Detail

Mass of fluid crossing a section per unit time.

Explore the idea

Explore the idea

Intuitive explanation

El flujo másico cuenta cuánta masa de fluido atraviesa una sección por unidad de tiempo.

Derivation

Como

\dot m=m/t

y

Q=Av

, con densidad constante

\dot m=\rho Q=\rho Av

.

Worked example

Agua con

\rho=1000\,\mathrm{kg/m}^3

que fluye a

Q=0{,}02\,\mathrm{m}^3/\mathrm{s}

transporta

\dot m=20\,\mathrm{kg/s}

.

Also known as

mass flow
flujo de masa

Related topics

Pressure and fluid mechanics

Last reviewed: 2026-09-14

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Related formulas

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Density
$\rho=\frac{m}{V}$
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Volumetric flow rate
$Q=\frac{dV}{dt}=Av$
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