a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.: Compare steam (def. 2).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use water vapor in a sentence
Instead, they are what happen when water vapor turns straight into ice.
That’s because, in both cases, the addition of abundant aerosol particles to the atmosphere gives water vapor numerous surfaces on which to condense, creating many small water droplets that form this brighter cloud and reflect incoming radiation.Ship exhaust studies overestimate cooling from pollution-altered clouds | Carolyn Gramling | February 1, 2021 | Science News
All three meteorites mostly let off water vapor, which accounted for 62 percent of the gas emitted on average.Crushed space rocks hint at exoplanets’ early atmospheric makeup | Lisa Grossman | January 26, 2021 | Science News
Air contains lots of different gases, including water vapor.
For those of you who did not spend any part of your lives near a Great Lake, lake-effect snow is a weather phenomenon in which cold winds blow across large bodies of warmer water, picking up water vapor from the surface.Bills-Ravens weather forecast: Snow looking like a possibility for Saturday | Matt Bonesteel | January 15, 2021 | Washington Post
So which influence wins out—increasing water vapor or decreasing wind shear?Earth Day: Discussing the Coming Climate Crisis With Heidi Cullen | Dominique Browning | April 22, 2012 | THE DAILY BEAST
That's not including water vapor, of which there is a fair amount.Islands of Space | John W Campbell
The Enterprise had taken damage in the last exchange; Koreff's spectroscopes showed her halo-ed with air and water vapor.Space Viking | Henry Beam Piper
The next most abundant product of the fermentation is water vapor which can often be seen passing off in clouds of steam.The First Book of Farming | Charles L. Goodrich
In the case just cited, the union of two volumes of hydrogen and one of oxygen results in precisely two volumes of water vapor.A History of Science, Volume 4(of 5) | Henry Smith Williams
The presence of some water vapor in the air is absolutely necessary to animal and plant life.General Science | Bertha M. Clark
Scientific definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.