Vapor-pressure meaning

The pressure exerted by water vapor in the atmosphere.
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The pressure exerted by a vapor in equilibrium with its solid or liquid phase. At the vapor pressure, there is no net evaporation.
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The pressure exerted by water vapor in the atmosphere.
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The pressure of a vapor in equilibrium with its liquid or solid form.
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The pressure exerted by a vapor on the solid or liquid phase with which it is in equilibrium. At pressures lower than the vapor pressure, more atoms or molecules of the liquid or solid vaporize and escape from the surface of the liquid or solid than are absorbed from the vapor, resulting in evaporation. At the vapor pressure the exchange is equal and there is no net evaporation.
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(physics) The pressure that a vapor exerts, or the partial pressure if it is mixed with other gases.
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