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Credit: U.S. Nuclear Regulatory Commission. Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.
Evaporation is a cooling process--each molecule lost lowers the energy of the remaining molecules Atmospheric Pressure acts as solid lid to evaporating liquid. Once Evaporation-Condensation Equilibrium is reached, the pressure that the gas exerts over the liquid is the Vapor Pressure of the liquid.