# Dew Point

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Dew point, abbreviated as $$T_d$$ is the temperature at which air must be cooled to become saturated with water vapor.  It is porportional to the amount of water vapor in a given amount of air and when the dew point is raised the more water vapor present, also the opposite.

## Dew Point formula

$$\large{ T_d = T - \frac{ 100 \;-\; RH }{ 5 } }$$
Symbol English Metric
$$\large{ T_d }$$ = dew point $$\large{F}$$ $$\large{C}$$
$$\large{ RH }$$ = relative humidity $$\large{dimensionless}$$
$$\large{ T }$$ = temperature $$\large{F}$$ $$\large{C}$$