humidity, definition of
- Humidity
Humidity is a term for the amount of water vapor in the air,
and can refer to any one of several measurements of humidity. Formally,
humid air is not "moist air" but a mixture of water vapor and other
constituents of air, and humidity is defined in terms of the water
content of this mixture, called the Absolute humidity. In everyday usage, it commonly refers to relative humidity, expressed as a percent in weather forecasts and on household humidistat's; it is so called because it measures the current absolute humidity relative to the maximum. Specific humidity is a ratio
of the water vapor content of the mixture to the dry air content (on a
mass basis). The water vapor content of the mixture can be measured
either as mass per volume or as a partial pressure, depending on the
usage.
In meteorology, humidity indicates the likelihood of precipitation, dew, or fog. High relative humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. This effect is calculated in a heat index table, used during summer weather.
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News & Blog articles where 'humidity' used:Related Tags: humidity, house
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