Earthen pitchers are porous, allowing water to seep through the walls to the outer surface. As this water evaporates from the outer surface, it takes latent heat of vaporization from the water inside the pitcher, causing the inside water to cool down.
In an earthen pitcher, the water remains cold due to the process of
Asked in UPPCS Prelims 2012 · Topic: Heat and Thermodynamics (Modes of Heat Transfer (Conduction, Convection, Radiation))
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