### Vapor Pressure of Water. Calculator Definition Formulas

Apr 06, 2022 Assume we want to calculate the vapor pressure of water in 86 F (30 C). Poof! The vapor pressure of water calculator found the pressure according to five formulas. The most often used is the Antoine equation (4.232 kPa), but the Buck formula (4.245 kPa) is usually the most accurate one for temperature ranges we typically look for.

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