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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.
Lesson Summary. Evaporation is a process during which water in a liquid state changes to gas or vapor. Water starts evaporating at 32 degrees F (0 degrees C), but it happens very slowly. The higher the temperature, the higher the rate of evaporation; however, evaporation cannot occur if there is no water available.