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:

 Units English Metric
\(\large{ p }\) = vapor pressure of water \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ A }\) = Antoine constant for water - -
\(\large{ B }\) = Antoine constant for water - -
\(\large{ C }\) = Antoine constant for water - -
\(\large{ T }\) = water temperature \(\large{F}\) \(\large{C}\)

 

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

 

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Tags: Pressure Equations Water Equations Vapor Equations