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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1 solution
It is true that pot has tiny pores, and water surfaces out side the pot and starts to vaporize. Now here is a problem, the surfaced water needs kinetic energy to turn to gaseous state and this energy is provided by the water inside pot, in the form of heat. This process repeats itself leaving the water at low temperatures than it was. So if we leave the water for an hour or so in the pot, it will become cooler. None of this is of any use if the pot conducts the outside heat in. Lucky for us the pot is a good insulator too. As a result we get cool water for free, no electricity, no pollution. So guys next time you go out for shopping get a pot...