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Humidity

  • By: Hiroyuki Kusaka
  • In: Encyclopedia of Geography
  • Edited by: Barney Warf
  • Subject:General Geography, Earth & Environmental Science

Humidity is a parameter representing the amount of water vapor in the air. This is expressed in numerous ways: relative humidity, mixing ratio, specific humidity, and absolute humidity. Relative humidity is the most commonly used term when we refer to humidity in the field of geography and in our daily lives. Relative humidity is the ratio of the water vapor content that is actually present in the air to the water vapor content in the saturated air at a prescribed temperature, and its values are given as a percentage. As a definition, relative humidity is expressed as the ratio of the actual vapor pressure (e, the partial pressure of water vapor) to the equilibrium or saturation vapor pressure (es, the vapor pressure of the saturated ...

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