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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 air is forecast to be extremely dry, with relative humidities under 10% through Friday.
—
Rong-Gong Lin Ii, Los Angeles Times, 22 Jan. 2025
In combination with critically dry vegetation and relative humidity down to 2%, elevated to locally critical fire weather conditions will continue through late Thursday.
—
Raul A. Reyes, Newsweek, 22 Jan. 2025
On Tuesday, warm weather with afternoon temperatures in the high 60s to low 70s, as well as low relative humidity levels in the teens and single digits, will add to the high fire risk.
—
Amy Graff, New York Times, 19 Jan. 2025
Use a hygrometer to track your home's relative humidity.
—
Kamron Sanders, Better Homes & Gardens, 15 Jan. 2025
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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 8 Feb. 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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