# Relative Humidity

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Relative humidity is a measure of the amount of moisture in the air with respect to the temperature.

## formula

$$\phi = 100 \frac{e}{e_s}$$

Where:

$$\phi$$ (Greek symbol phi) = relative humidity

$$e$$ = actual vapor pressure

$$e_s$$ = saturated vapor pressure