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One can calculate the absolute humidity (AH) from the relative humidity (r) using three equations: (1) the equation for mixing ratio, (2) an equation for relative humidity expressed in terms of mixing ratio, and (3) the Clausius-Clapeyron equation, which relates saturation vapor pressure to temperature.

The result of combining the three equations is:

AH = (1324 r/T) [exp {5417.75 (1/273 - 1/T)}]

where AH is expressed in grams per cubic meter, T is temperature in Kelvin, r is relative humidity (range is 0 to 1), and the relation holds true for T>273. For T<273, replace 5417.75 with 6139.81.

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Which is the comparison of the amount of moisture in the air to the amount of moisture it can hold?

relative humidity


How can one determine the relative humidity by using the temperature as a reference point?

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