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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 Lilac fire — which began north of West Lilac Road, just west of Interstate 15 — was burning in an area where the relative humidity is very low.
—Gary Robbins, San Diego Union-Tribune, 21 Jan. 2025
In addition to gusty winds, relative humidity will be very low, down to 8%.
—Max Golembo, ABC News, 15 Jan. 2025
Typically, this means winds must be at least 35 miles per hour, the relative humidity must be below 20 percent, and dry fuels must be present.
—Michael Gfoeller and David H. Rundell, Newsweek, 15 Jan. 2025
Red flag warnings alert residents to dangerous fire weather as measured by winds of at least 20 mph and relative humidity of 25% or less, according to the weather service.
—Alexandra Marquez, NBC News, 13 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 24 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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