# Pressure Coefficient

## The ratio of pressure forces to inertial forces

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The pressure coefficient is is the ratio of *pressure forces* to *inertial forces* and can be expressed as

C_{p}= dP / (ρ v^{2}/ 2)

= dh (ρ v^{2}/ 2 g) (1)

where

C_{p}= pressure coefficient

dp = pressure difference (N)

ρ = fluid density (kg/m^{3})

v = flow velocity (m/s)

dh = head (m)

g = acceleration of gravity (= 9.81 m/s^{2})

The pressure coefficient is important in most fluid flow applications.

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