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Why do you feel cooler on a hot breezy day than on a hot day in still air?

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Because your body is sweating on a hot day and the breeze causes the sweat to evaporate which causing a cooling effect. (like a swamp cooler if you have ever had one.. take a rag and dip it in warm water then twirl it around really fast, you will notice it is much much cooler...) this is called Evaporative Cooling

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thankyou alot
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Yes, evaporation is the mechanism how sweating cools the body. The greater the evaporation, the more heat is pulled away. Wind increases the body surface area that is exposed to the air which increases the rate of evaporation. That is why blowing on a hot spoonful of soup cools it. Air humidity is another factor. If the air is very dry evaporation is increased and the body is better able to cool itself down. If the air is humid, evaporation is decreased and the body is less able to cool itself. That is why a dry heat feels lees warm than a humid heat of the same temperature.
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Evaporation.

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