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The molecules in any substance do not have exactly the same energy: there are those with more (hot) and those with less (cool). Temperature is a function of the distribution of energy through the molecules: the higher the overall energy of the molecules, the higher the temperature.

Evaporation occurs when the higher energy (hot) molecules leave the substance exactly because their energy is above average (they are too hot). This leaves behind lower energy molecules (cooler molecules) which, in turn, means that the overall energy of the substance diminishes. Another way of putting it: leaving behind cooler molecules means the temperature goes down closer to them.

Its a heat exchange. like the high energy molecule evaporate and then the low energy remain in the material low energy means cool molecules remain at the surface. its a cooling process in this way.

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14y ago

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