Why so cool

We humans have been using Clay Pots for cool water from a long time. But actually how the clay pot can keep the water cool even though the temperature out side is very hot?

It is because the water inside the pot, comes out on to the pot's surface through tiny pores (holes) present on the pot and evaporate. During this evaporation the required heat is taken from the water inside. This process repeats itself and as a result the water inside gets cooled.

pic credits: www.skymetweather.com

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