# Venturi Meter Flow Rate

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

Venturi meter flow rate measures the velocity of a fluid through a pipe.

Abbreviated as $$Q$$

## formula

$$Q = A_2 \sqrt { \frac { {2 \left ( p_1 \; - \; p_2 \right)} } { \rho \left( 1\; - \; \left( \frac {A_2} {A_1} \right) ^2 \right) } }$$

Where:

$$Q$$ = flow rate

$$A_1$$ = area 1

$$A_2$$ = area 2

$$p_1$$ = pressure 1

$$p_2$$ = pressure 2

$$\rho$$ = density