All related- Why does lower temperatures and higher humidy feel so hot? Is overheating when hiking as dangerous or more likely in no humidity or high? How does sweating help cool you down?
In: Biology
It’s pretty simple. Your body sweats to reduce heat. That sweat is evaporated into the air normally, which cools your body (exothermic reaction).
When the air is already saturated, your body sweats, but not very much of that sweat can be evaporated into the air, as it is already saturated with water (high humidity). So you sweat, but you aren’t cooled off.
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