# Absolute Pressure

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

A pressure at absolute zero can only exist in a total vacuum and any pressure above this is called absolute pressure.  Absolute pressure is the amount by which the measured pressure exceeds a perfect vacuum.

### absolute PRESSURE FORMULA

$$\large{ p_a = p_g \; + \; p_{atm} }$$

$$\large{ p_a = p_g \; + \; p_v }$$

Where:

$$\large{ p_a }$$ = absolute pressure

$$\large{ p_g }$$ = gauge pressure

$$\large{ p_{atm} }$$ = atmospheric pressure

$$\large{ p_v }$$ = vacuum pressure

Solve for:

$$\large{ p_g = p_a \; - \; p_{atm} }$$

$$\large{ p_{atm} = p_a \; - \; p_g }$$