Question

How does the water kept in matka become cool during summer

Answer 1

Explanation:

Because the earthen pot has a large number of extremely small pores in its walls. Some of the water continuously keeps seeping through these pores to the outside of the pot. This waster evaporates continuously and takes the latent heat required for vaporisation from the earthen pot and the remaining water. In this way, the remaining water loses heat and gets cooled. Please note that all the water on the earth does not get evaporated due to the high value of the latent heat of vaporisation of water.

Answer 2

Water looses its temperature through small pores present in the pot. Hence in an earthen pot (matka) become cool during summer.