specific humidity

noun
the ratio of the mass of water vapor in air to the total mass of the mixture of air and water vapor.
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specific humidity
 
n
the mass of water vapour in a sample of moist air divided by the mass of the sample

Collins English Dictionary - Complete & Unabridged 10th Edition
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specific humidity

mass of water vapour in a unit mass of moist air, usually expressed as grams of vapour per kilogram of air, or, in air conditioning, as grains per pound. The specific humidity is an extremely useful quantity in meteorology. For example, the rate of evaporation of water from any surface is directly proportional to the specific humidity difference between the surface and the adjoining air

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The buoy observations of relative humidity and supporting data from the buoys were used to calculate specific humidity.
The moisture concentration in the air is measured as specific humidity.
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