What Is the Vapor Pressure of Water at 25 C?

The vapor pressure of water at 25 degrees Celsius is 23.8 mmHg. The formula for calculating the vapor pressure of water is P = exp (20.386 – 5132 /T) mmHg. “P” stands for the vapor pressure in mmHg and “T” stands for the temperature in Kelvin.

Another formula for calculating the vapor pressure of water is log10P = A – B/C+T. The temperature in Celsius is represented by T. The vapor pressure in mmHg is represented by P. Three constants are required to use this formula. For temperatures between 1 and 100 degrees Celsius, A = 8.07131, B=1730.63 and C=233.426. For temperatures between 99 and 374 degrees Celsius, A= 8.14019, B= 1810.94 and C= 244.485.

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