relative humidity

noun

Definition of relative humidity 

: 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 opposite is true when the relative humidity decreases because the rate of perspiration increases. Cincinnati Enquirer, Cincinnati.com, "Not a dry heat: Heat index in 100s," 18 June 2018 When the relative humidity of the atmosphere is high, there is essentially no more room in the surrounding environment for liquid, including sweat. Greg Porter, Washington Post, "PM Update: Mild and muggy tonight, oppressive heat and humidity Monday," 17 June 2018 Thus, relative humidity depends on the air temperature and its moisture content. Tom Skilling, chicagotribune.com, "Ask Tom: What does 'relative humidity' mean?," 29 May 2018 Criteria for a Red Flag Warning include a relative humidity less than 25 percent, warm temperatures and high winds for several hours, combined with dry vegetation in the area. Kimberly Rapanut, azcentral, "Why fire danger is extremely high Monday in northern Arizona," 20 May 2018 The relative humidity of the argon gas is at 40 percent, and the case remains continually at 67 degrees Fahrenheit. Joe Pappalardo, Popular Mechanics, "The Science of Saving the Declaration of Independence," 3 July 2018 The heat index is a term weather forecasters use to describe what the air temperature feels like when combined with the relative humidity. John Wisely, Detroit Free Press, "Heat is here to stay through 4th of July holiday," 1 July 2018 The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. Cincinnati Enquirer, Cincinnati.com, "Not a dry heat: Heat index in 100s," 18 June 2018 Authorities said the fire is being driven by low relative humidity, erratic winds and high temperatures. Alene Tchekmedyian, latimes.com, "3,000-acre wildfire in Northern California prompts evacuations, destroys 12 structures and threatens hundreds more," 25 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'relative humidity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of relative humidity

1819, in the meaning defined above

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The first known use of relative humidity was in 1819

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More Definitions for relative humidity

relative humidity

noun

Medical Definition of relative humidity 

: 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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