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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
Hydrogen combustion releases water vapor instead of greenhouse gas emissions, which is why the Biden administration sees it as a more sustainable alternative to fossil fuels.
—Justine Calma, The Verge, 6 Jan. 2025
Dense fog forms when the air near the ground cools down to its dew point, the temperature when water vapor condenses into liquid water droplets suspended in the air.
—Dan Perry, Newsweek, 18 Dec. 2024
Plus, scientists are still studying the effects of events like the January 2022 Tonga volcanic eruption, which introduced vast quantities of water vapor and sulfur dioxide into the atmosphere.
—Stefanie Waldek, Space.com, 16 Jan. 2025
This analogy captures the atmosphere's ability to absorb a larger and larger amount of water vapor as temperatures increase, and wring out more and more water due to such temperature changes.
—Andrew Freedman, Axios, 12 Jan. 2025
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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 2 Feb. 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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