• Humidity
  • Generally, some measure of the water vapor content of the air. Popularly, same as relative humidity. 
Abstract from DBPedia
    Humidity is the amount of water vapor in the air. Water vapor is the gaseous state of water and is invisible. 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. The amount of water vapor that is needed to achieve saturation increases as the temperature increases. As the temperature of a parcel of air becomes lower it will eventually reach the point of saturation without adding or losing water mass. The differences in the amount of water vapor in a parcel of air can be quite large, for example; A parcel of air that is near saturation may contain 28 grams of water per cubic meter of air at 30 °C, but only 8 grams of water per cubic meter of air at 8 °C 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 meter. 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.

    湿度(しつど、英: humidity)とは大気中に含まれる水蒸気の量を数値で表したもの。湿度にも数種類の指標があるが、気象予報などで一般的に使用されるのは相対湿度である。絶対湿度(absolute humidity)とは、国際的には容積絶対湿度のことである。しかし、日本では空気調和工学の分野では重量絶対湿度(混合比)が「絶対湿度」と呼ばれている。


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