You know how if you’ve got wet hands, or you’ve just got out the shower, any breeze feels very cold?
That’s because evaporating liquid takes energy in the form of heat, so it cools you.
This is literally what sweat does. It comes out of your skin makes it wet, and when it evaporates, it absorbs energy (heat) from you.
Note that if you’re somewhere very humid, and hot, this effect doesn’t work nearly as well, which is why you end up soaked in sweat, and still pretty hot.
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