Human Responses to Heat
When the body gets too hot, it begins to perspire (sweat) to cool itself off.
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If the sweat is not able to evaporate off the skin, the body cannot regulate temperature since evaporation is a cooling process.
When the moisture in the atmosphere increases, the ability for perspiration to evaporate decreases.
The human body feels warmer in humid conditions, and it feels cooler in drier conditions.