# Pressure Differential

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Pressure differential, abbreviated as $$\Delta p$$ or $$p_d$$, is the pressure difference between two points of a system.

### PRESSURE DIFFERENTIAL FORMULA

$$\large{ \Delta p = \frac { 1.59923 \; p \; d^4 \; \rho } { m_f^2 } }$$

Where:

$$\large{ \Delta p }$$ = pressure differential

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

$$\large{ d }$$ = pipe diameter

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

$$\large{ p }$$ = change in pressure