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water vapor
noun
: water in a vaporous form especially when below boiling temperature and diffused (as in the atmosphere)
Examples of water vapor in a Sentence
Recent Examples on the Web
In hydrogen fuel cells, electricity is generated through chemical reactions involving hydrogen and oxygen, resulting in heat and water vapor as the only byproducts.
—Ken Silverstein, Forbes, 19 Dec. 2024
Humans are effective at cooling down in hot and dry environments, but in humid environments like Hong Kong, a high amount of water vapor in the air makes sweat evaporate more slowly, so the body has to work harder to cool itself.
—Olatunji Osho-Williams, Smithsonian Magazine, 18 Dec. 2024
Source, a startup based in Scottsdale, Ariz., makes a panel that uses a material to capture water vapor from the air.
—Katie Fehrenbacher, Axios, 20 Nov. 2024
Primary hazards include high levels of volcanic gases—predominantly water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2).
—Josh Hammer, Newsweek, 23 Dec. 2024
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Word History
First Known Use
15th century, in the meaning defined above
Time Traveler
The first known use of water vapor was
in the 15th century
Dictionary Entries Near water vapor
Cite this Entry
“Water vapor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20vapor. Accessed 7 Jan. 2025.
Kids Definition
water vapor
noun
: water in a gaseous form especially when below boiling temperature and spread through the atmosphere
Medical Definition
water vapor
noun
: water in a vaporous form especially when below boiling temperature and diffused (as in the atmosphere)
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