Question

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

Answer 1

Answer:

There are a large number of extremely small pores in an earthen pot through which the water kept inside the pot keeps on evaporating and takes the latent heat required for vaporization from the earthen pot and remaining water. The earthen pot and water hence loses heat and this makes the water inside the pot cool.

Explanation:

Answer 2

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Due to the small holes (pores) present in the walls of the earthen pot, the water oozes out slowly. As it comes on the outer surface of matka, it evaporates. The energy needed for evaporation is taken from the water kept in the earthern pot. As a result, water kept in the earthern pot becomes cold.