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water vapor
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noun
a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.Compare steam (def. 2).
QUIZ
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Which of the following nouns has an irregular plural form?
Origin of water vapor
First recorded in 1875–80
Words nearby water vapor
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use water vapor in a sentence
Scientific definitions for water vapor
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
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