Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the main pathway for the transfer of water from a liquid state back to the water cycle as atmospheric water vapor. Oceans, seas, lakes and rivers provide almost 90% of the moisture in the atmosphere through evaporation, and the remaining 10% comes from plant transpiration.
Evaporation requires heat (energy). Energy is used to break the bonds that hold water molecules together, so water evaporates easily at boiling point (100 ° C), but evaporates much more slowly at freezing point. Pure evaporation occurs when the evaporation rate exceeds the condensation rate.
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