The vapour pressure of water is the pressure at which water vapour is saturated. At higher pressures water would condense. The water vapour pressure is the partial pressure of water vapour in any gas mixture saturated with water. As for other substances, water vapour pressure is a function of temperature and can be determined with Clausius–Clapeyron relation.
Read more about Vapour Pressure Of Water: Approximation Formula, Table of Water Vapour Pressures
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