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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
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
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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
Britannica.com: Encyclopedia article about relative humidity
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