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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
By steadily adding water vapor back into the air, humidifiers can help restore balance. Daryl Austin, USA Today, 13 Dec. 2025 The team found that molecules such as silicon monoxide, water vapor, and aluminum monoxide appear exactly where clumpy dust clouds were seen in the VLT data. Robert Lea, Space.com, 11 Dec. 2025 On average, an atmospheric river carries an amount of water vapor roughly equivalent to the average flow of water at the mouth of the Mississippi River, with particularly strong atmospheric rivers capable of moving up to 15 times more. Joe Edwards, MSNBC Newsweek, 9 Dec. 2025 Humidity tells how much water vapor is in the air, and the more water vapor and moisture there is, the higher the humidity level. Karen Brewer Grossman, Southern Living, 4 Dec. 2025 See All Example Sentences for water vapor

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

Browse Nearby Words

Cite this Entry

“Water vapor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20vapor. Accessed 19 Dec. 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)
Last Updated: - Updated example sentences
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