# Dew Point Temperature

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Dew point, abbreviated as $$T_d$$, is the temperature the air needs to be cooled to (at constant pressure) in order to achive a relative humidity of 100%.

## Dew point Temperature formula

$$\large{ T_d = \left( \frac{ RH }{ 100 } \right)^{ \frac{1}{8} } \; \left( 112 + 0.9 \; T \right) + 0.1 \; T - 112 }$$
Symbol English Metric
$$\large{ T_d }$$ = dew point temperature $$\large{F}$$  $$\large{C}$$
$$\large{ RH }$$ = relative humidity $$\large{F}$$ $$\large{C}$$
$$\large{ T }$$ = temperature $$\large{F}$$ $$\large{C}$$