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

Ans. An earthen pot has small pores in its walls. When water is poured into it, some of it seeps through these pores onto its outer surface. On reaching there, it evaporates. The heat required for evaporation is taken from the earthen pot and from the water in it. As a result, the water in an earthen pot gets cooled down.

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