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How does the water kept in an earthen po...

How does the water kept in an earthen pot (mataka) become cool during summer?

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The earthen pot is full of small pores. Water present in these pores has a tendency to escape at a fast rate during summer. The escaping molecules of water appear as water vapours and evaporate. Since cooling is caused in evaporation, the temperature of the water inside the earthen pot gets considerably lowered and it becomes cold.
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