ESS124
Prof. Jin-Yi Yu
Saturation Vapor Pressure
•Saturation vapor pressure describes how much water vapor is needed to make the air saturated at any given temperature.
•Saturation vapor pressure depends primarily on the air temperature in the following way:
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•Saturation pressure increases exponentially with air temperature.
D:\yu\maker\talk\uci\class\ESS55\image\saturate.pressure.curve.gif D:\yu\maker\talk\uci\class\ESS55\image\clausisus-clapeyron.eq.gif D:\yu\maker\talk\uci\class\ESS55\image\saturated.vapor.eq.gif
The
Clausius-Clapeyron
Equation
L: latent heat of evaporation; a: specific volume of vapor and liquid