Q. 7

An ordinary electric fan does not cool the air, still it gives comfort in summer. Explain.

Answer :

An electric fan does not cool the air. It just creates a forced circulation of the air present inside the room. This circulation will facilitate the evaporation of sweat, that is present on the surface of one’s skin. The heat for the evaporation is taken from the skin itself, and this will cause a sense of cooling.

Hence, on a summer day, even though the air is not getting cooled by the fan, the evaporation of the sweat will create comfort for the body.


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