Question

why does evaporation cool a liquid .please short ans.... :)

Answer 1

hello.
evaporation absorbs the heat from neighbouring molecules of liquid to evaporate some molecules of that liquid in this way by evaporating a liquid the process cool down the remaining liquid.
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Answer 2

the remaining particles in the liquid have lower Kinetic energy than before .so evaporation cool a liquid . This is why sweating cool you down.