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Mechanical Properties Of Fluids

Question
CBSEENPH11018333

Why do the new earthen pots keep the water cooler than the old one?

Solution
There are fine pores on the surface of new earthen pots. The water rises in these pores due to capillary action and spreads over the surface. The water from the surface of pot, when evaporates, cools down the pot and keeps the water cold. With time, the dust particles  fill the capillaries of pot and hence the above phenomenon do not take place in old pots.