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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
First recorded in 1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for water vapor
Historical Examples
  • Crystals of frost puffed out as the water vapor left the air.

    Satellite System Horace Brown Fyfe
  • This water vapor changes into droplets of water when it gets cool enough.

    Common Science Carleton W. Washburne
  • When we say that water evaporates, we mean that it changes into water vapor.

    Common Science Carleton W. Washburne
  • The molecules that have shot off into the air make up the water vapor.

    Common Science Carleton W. Washburne
  • Then the water vapor in it condenses into droplets of water, and these form a cloud.

    Common Science Carleton W. Washburne
  • When the air is fully charged with water vapor it is said to be saturated.

    Meteorology Charles Fitzhugh Talman
  • Do you wish to prove that the water vapor is there, although unseen?

  • The problem is complicated by the behavior of the load of water vapor.

    Wind and Weather Alexander McAdie
  • The exact values of these pressures vary with degree of water vapor present and with temperature.

    The Nature of Animal Light E. Newton Harvey
  • According to Abegg's Handbuch der anorganischen Chemie, the maximum luminescence pressure with water vapor present, is 320 mm.

    The Nature of Animal Light E. Newton Harvey
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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