Explain the cooling effect of ear then pot (pitcher) ?
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The earthen pot has minute pores through which water sips out and droplets of water deposit on outer surface of pot. When this water evporates, it takes latent heat from pot ans water inside. So water inside cools down
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The water kept in an earthen pot seeps into the small pores in the pot and evaporates from the surface of the pot. The heat required for evaporation is taken from water inside the pot, thus cooling the water stored inside. This is the reason why on hot summer days water remains cool in earthen pot.
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