# Absolute Pressure

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

Absolute pressure is pressure that is measured from the starting point of 0 in a perfect vacuum.

## FORMULA

$$p_a = p_g \;+\; p_{at}$$

Where:

$$p_a$$ = absolute pressure

$$p_g$$ = gauge pressure

$$p_{at}$$ = atmospheric pressure

Solve for:

$$p_g = p_{at} \;+\; p_a$$

$$p_{at} = p_g \;+\; p_a$$