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5 Cards in this Set

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Absolute humidity
The mass of water vapor contained in a certain volume of air.
Greenhouse effect
The process by which certain gases (principally water, carbon dioxide, and methane) trap hear that would otherwise escape the earth and radiate into space.
Humidity
The moisture content of the air.
Parts per million
The number of molecules (or atoms) of a substance in a mixture for every one million molecules (or atoms) in that mixture.
Relative humidity
A quantity expressing humidity as a percentage of the maximum absolute humidity for that particular temperature.