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water vapor

a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.
Compare steam (def 2).
Origin of water vapor
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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water-vapor in Science
water vapor  
Water in its gaseous state, especially in the atmosphere and at a temperature below the boiling point. Water vapor in the atmosphere serves as the raw material for cloud and rain formation. It also helps regulate the Earth's temperature by reflecting and scattering radiation from the Sun and by absorbing the Earth's infrared radiation. See also vapor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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