relative humidity

noun

: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature

Examples of relative humidity in a Sentence

Recent Examples on the Web
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The big picture: Four of the biggest blazes remained zero percent contained during low relative humidity and high winds that were beginning to weaken on Wednesday evening, though fresh spot fires ignited and a new blaze in the Hollywood Hills prompted fresh mandatory evacuation orders. Rebecca Falconer, Axios, 9 Jan. 2025 The higher relative humidity level outside also helps keep cut greens fresh. Paul Cappiello, The Courier-Journal, 13 Dec. 2024 The risk of wildfire was enhanced by low relative humidity, which had fallen to the 5% to 15% range by early afternoon. Karen Kucher, The Mercury News, 11 Dec. 2024 Dry conditions persist, with relative humidity below 10%, prompting the weather service to issue Red Flag warnings until 2 p.m. Wednesday. Hanna Park, Robert Shackelford and Mary Gilbert, CNN, 11 Dec. 2024 See all Example Sentences for relative humidity 

Word History

First Known Use

1819, in the meaning defined above

Time Traveler
The first known use of relative humidity was in 1819

Dictionary Entries Near relative humidity

Cite this Entry

“Relative humidity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/relative%20humidity. Accessed 18 Jan. 2025.

Kids Definition

relative humidity

noun
: the amount of water vapor actually present in the air compared to the greatest amount possible at the same temperature

Medical Definition

relative humidity

noun
: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature compare absolute humidity

More from Merriam-Webster on relative humidity

Last Updated: - Updated example sentences
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