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Show i I How Fan Cools Room I I How does an electric fan cool the ( air of a room The fan does not I actually cool the air, but sets it in , motion. As the moving air passes I across one's body, it increases ( evaporation of moisture from the j skin, which causes a sensation of coolness. When there is no breeze, a layer of air saturated with all the moisture it can hold tends to form over the body surface, preventing pre-venting further evaporation, but the breeze blows it away and brings unsaturated air which can take up more moisture. |