Question

Explain with an example that when a liquid evaporates, it takes heat from the surroundings.

Answer 1

For example, when you put a drop or two of ether on your hand, it evaporates and you feel a cooling effect on your hand. That cooling effect is due to some amount of heat being lost from your hand when the ether evaporated. The ether took heat from the surrounding area (i.e. of your hand) and evaporated.
We can thus conclude that when a liquid evaporates, it takes heat from its surroundings.

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Answer 2

If some spirit is poured on cotton wrapped around the bulb of a thermometer, the reading of the thermometer falls. This shows that cooling is produced when a liquid evaporates taking heat from surroundings

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