水蒸气 Water vapor
（重定向自Aqueous vapor）
水蒸气（也称氛气），是水（H2O）的气体形式。当水达到沸点时，水就变成水蒸气。在海平面一标准大气压下，水的沸点为100°C或212°F或373.15K。当水在沸点以下时，水也可以缓慢地蒸发成水蒸气。而在极低压环境下（小于0.006大气压），冰会直接升华变水蒸气。水蒸气之密度为 0.59764 千克/立方米（100°C/212°F，101330Pa）
水蒸气可能会造成温室效应，是一种温室气体。
Aqueous vapor
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Water vapor 水蒸气
（重定向自Aqueous vapor）
Water vapor, water vapour or aqueous vapor, is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Unlike other forms of water, water vapor is invisible. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation. It is lighter than air and triggers convection currents that can lead to clouds.
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