How does the water kept in an earthen pot become cool during summer?

The process of evaporation is the conversion of liquid into a gaseous state. An earthen pot or a matka is porous in nature. Water placed in earthen pots is evaporated from minuscule pores it has as it is made of mud particles.

This evaporation of water produces a cooling effect. Some of the heat energy that is generated is used in the process of evaporation. Hence, water stored in earthen pots tends to become cooler in summer.

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