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Definition: A measure of the amount of water in air divided by the amount of water that the air could hold, expressed as 100 x P/P0, where P is the pressure of the water vapor in the air and P0 is the equilibrium vapor pressure of water at the same temperature.
Example: A relative humidity of 95% indicates that there is 95/100ths as much water in the air as that air is capable of holding at that temperature.
