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humidity
Humidity is the amount of water vapor in the air. Water vapor is the gaseous state of water and is invisible.〔(【引用サイトリンク】url=http://www.weatherquestions.com/What_is_water_vapor.htm )〕 Humidity indicates the likelihood of precipitation, dew, or fog. Higher 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 or humidex.
There are three main measurements of humidity: absolute, relative and specific. Absolute humidity is the water content of air at a given temperature expressed in gram per cubic metre.〔Wyer, S.S., "A treatise on producer-gas and gas-producers", (1906) The Engineering and Mining Journal, London, p.23〕 Relative humidity, expressed as a percent, measures the current absolute humidity ''relative'' to the maximum (highest point) for that temperature. Specific humidity is a ratio of the water vapor content of the mixture to the total air content on a mass basis.
==Types==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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