It is your a body's way of controlling temperature. Exertion raises the body's temp and the perspiration brings the temp. down.
because our body is over-heating. the heat comes out of the body as perspiration and the particles or molecules with the most kinetic energy evaporate leaving the colder molecules behind, thus reducing the temperature of the body.
i know a kid who has perspiration troubles and he cannot run around too much in the sun coz he overheats ... therefore he needs to stay in cooler temperatures most of the time.
The work done by the muscles during violent exercise heats the body. The sweat glands of the skin then open, allowing water to exude and spread over the skin. The evaporation of the water cools the skin, and with it the body as a whole.
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