# Water Vapor Pressure

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Water vapor pressure is the pressure of water vapor at a given temperature, also the component of atmospheric pressure contributed by the presence of water vapor.

### Water Vapor Pressure formula

$$\large{ p = 10^{\; A \;-\; \frac { B } { C \;+\; T } } }$$

Where:

$$\large{ p }$$ = vapor pressure of water

$$\large{ A }$$ = Antoine constant for water

$$\large{ B }$$ = Antoine constant for water

$$\large{ C }$$ = Antoine constant for water

$$\large{ T }$$ = water temperature

### Antoine Constants for Water

Water TemperatureABC
1 to 100 degrees celsius 8.07131 1730.63 233.426
99 to 374 degrees celsius 8.14019 1810.94 244.485