Test Your Vocabulary. Can you spell these 10 commonly misspelled words? Love words? Need even more definitions? Homophones, Homographs, and Homonyms The same, but different. Ask the Editors 'Everyday' vs. What Is 'Semantic Bleaching'? How 'literally' can mean "figuratively".
Literally How to use a word that literally drives some pe Is Singular 'They' a Better Choice? The awkward case of 'his or her'. A major source of water vapor in Kentucky is the Gulf of Mexico. Most of the water vapor in the atmosphere is contained within the first 10, feet or so above the earth's surface. Water vapor also is called moisture. Absolute humidity expressed as grams of water vapor per cubic meter volume of air is a measure of the actual amount of water vapor moisture in the air, regardless of the air's temperature.
The higher the amount of water vapor, the higher the absolute humidity. For example, a maximum of about 30 grams of water vapor can exist in a cubic meter volume of air with a temperature in the middle 80s.
Absolute and specific humidity are quite similar in concept. In other words, it is a measure of the actual amount of water vapor in the air compared to the total amount of vapor that can exist in the air at its current temperature. What we "feel" outside is the actual amount of moisture absolute humidity in the air. Meteorologists routinely consider the "dewpoint" temperature instead of, but analogous to absolute humidity to evaluate moisture, especially in the spring and summer.
The dewpoint temperature, which provides a measure of the actual amount of water vapor in the air, is the temperature to which the air must be cooled in order for that air to be saturated. Although weather conditions affect people differently, in general in the spring and summer, surface dewpoint temperatures in the 50s usually are comfortable to most people, in the 60s are somewhat uncomfortable humid , and in the 70s are quite uncomfortable very humid.
In the Ohio Valley including Kentucky , common dewpoints during the summer range from the middle 60s to middle 70s. Dewpoints as high as 80 or the lower 80s have been recorded, which is very oppressive but fortunately relatively rare. While dewpoint gives one a quick idea of moisture content in the air, relative humidity does not since the humidity is relative to the air temperature. In other words, relative humidity cannot be determined from knowing the dewpoint alone, the actual air temperature must also be known.
If the air is totally saturated at a particular level e. If the relative humidity is percent i. It simply means that the maximum amount of moisture is in the air at the particular temperature the air is at.
Saturation may result in fog at the surface and clouds aloft which consist of tiny water droplets suspended in the air. Droplets grow through a process called "collision-coalescence" whereby droplets of varying sizes collide and fuse together coalesce. Ice crystal processes including deposition and aggregation also are important for particle growth.
In thunderstorms, hail also can develop. Once the suspended precipitation particles grow to sufficient size, the air can no longer support their weight and precipitation falls from the clouds. In humid climates, thunderstorms often cause heavier rain than general wintertime rainfall since moisture content in the air typically is higher in the spring and summer, and since air usually rises at a much more rapid rate within developing thunderstorms than in general winter systems.
Meteorologists are not just interested in dewpoint or absolute humidity at the surface, but aloft as well. Precipitable water PW is a measure of the total amount of water vapor contained in a small vertical column extending from the surface to the top of the atmosphere. Compare absolute humidity , dew point , mixing ratio , specific humidity. Origin of relative humidity First recorded in — Words nearby relative humidity relative clause , relative complement , relative density , relative deprivation , relative frequency , relative humidity , relative impediment , relative leukocytosis , relatively , relatively prime numbers , relative major.
How to use relative humidity in a sentence Even so, the EPA developed a correction formula for PurpleAir monitor readings that accounts for relative humidity , among other factors.
Camden Walker May 14, Washington Post. Winter will make the pandemic worse. Obama Is Right on Race. The Media Is Wrong. Uncanny Tales Various. The ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage.
Published by Houghton Mifflin Company.
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