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Clay itself is a mixture of water and mud i.e., what we mould to make a pot. After that the wet clay pot is heated so that all the moisture in the wet clay is taken out completely. But who is going to fill the place of the moisture?? Nothing. So that whole material is purely porous with a very fine holes all over. Now when u pour water of any temperature more than the room temperature into the pot.. The water first spreads itself on to the walls of the pot. Due to the internal pressure of water, the water is forced to contact to the pot inner walls.(Don't get confused. This happens with any fluid or material, generally for solids its called as angle of repose, but for fluids, the angle of repose is 180 deg, i.e., horizontal force in all directions). So the water molecules starts filling the air gaps of the pot. In this condition, due to the very fine holes, the water molecules loose their contact and forms in to separate groups of water particles. Since the water volume is very less, it tends to go away from the pothole, and for that is has to be converted in to vapor state. But the temperature of the water is not enough to change its state from liquid to gaseous. So remember that the water is still in contact with the pot, so the heat is taken from the pot shell, thus reaches its latent heat and changes it state from liquid to gaseous. This is why the pot first cools rather to the water inside. In addition, this is a pure Heat and Mass Transfer subject. This is how the pot shell takes out the heat of the water and the imprisoned water molecules in the pot shell take that heat out and becomes vapor. If you can observe a pot with water for a while, check for the following points., 1) The Whole Pot Gets Wet in outside till the level of water. 2) If you can feel the water getting cooled after an observation of 30 mins., then check for the water level in the pot. (It surely goes down and where does that water go ??) 3) Check the Pot Shell inner face temperature and water temperature, and find out which is lesser.

:in an easier way..we can say that the mud pot or clay pot is a poor conductor

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15y ago

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