Water Vapor Pressure

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 Temperature	A	B	C
1 to 100 degrees celsius	8.07131	1730.63	233.426
99 to 374 degrees celsius	8.14019	1810.94	244.485