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Given the wet bulb temperature, dry bulb temperature and ambient pressure, the humidity of the air can be calculated as follows:.The saturated vapour pressure of water vapour at the wet bulb temperature, Also the saturated vapour pressure of water vapour at the dry bulb temperature is:Moisture is being evaporated from the surface of the muslin sleeve into the surrounding air.
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By rearranging the terms and grouping the constants, the psychrometric equation is obtained:The numerical difference between the dry- and wet-bulb temperatures is known as the Since the rate of moisture evaporation depends on the speed of the air over the wet-bulb, the wet-bulb temperature will also depend on the air speed.


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For evaporation to take place, heat must be supplied, and this can only come from the ambient air in the form of sensible heat, with the temperature of the bulb lower than that of the surrounding air.

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