Question

why to people perspire a lot on a hot humid day​

Answer 1

On dry days, sweat evaporates quickly, which means it also carries away heat faster. On humid days, when the air is already saturated with water,sweat evaporates more slowly. This explains why it feels so much hotter in high humidity.

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Answer 2

people lose a lot of water or moisture on a hot sunny day because of heat that is conducted in their body because of the sun and thus they lose a lot of water from their body this may also lead to dehydration which is not good so drink a lot of water on a hot and humid day and stay hydrated.