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Humidity is the amount of moisture
(water vapor) in the air. It can be expressed as absolutehumidity or relative
humidity. Absolute humidity is the mass of water
vapor divided by a unitvolume
of air (grams of water/cm3
of air). Relative humidity is the amount of
water vaporpresent in
the air divided by the maximum amount that the air could
contain at that temperature.Relative
humidity is expressed as a percentage. The relative
humidity is 100% if the air issaturated
with water vapor and 0% if no water vapor is present in
the air at all.
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