from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The amount of water vapor present in a unit volume of air, usually expressed in grams per cubic meter.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun meteorology In a system of moist air, the
ratioof the mass of water vaporpresent to the volumeoccupied by the mixture, that is, the densityof the water vapor component. Absolute humidity is usually expressed in gramsof water vaporper cubic meteror, in engineering practice, in grainsper cubic foot. Because this measure of atmospheric humidity is not conservativewith respect to adiabaticexpansion or compression, it is not commonly used by meteorologists. (Also called vapor concentration and vapor density). See relative humidity.
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