Specific humidity is a method of expressing the amount of aqueous vapor in air by using a ratio of water vapor to dry air. Specific humidity is expressed as a ratio of kilogram of water vapor, mw, per kilogram of air, mw.
That ratio can be given as:
Partial pressure of water vapor and air can also be used to express the ratio.
See also; Humidity, Absolute humidity, Relative Humidity, Concentration.
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