Question

how does the water keep in become cool during summer

Answer 1

It use to become cool as the process of evaporation takes place...
to evaporate the water molecules absorb heat(in order to get kinetic energy) From the remaining water molecule and results in loss of heat and further causes cooling..........

Answer 2

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The earthen pot have porous in it through which the water particles getting enough energy from the surroundings ccotinue to reside and gets evaporated leaving the inside the matter cool during summers.