Will give medal. 4. Explain in how perspiration helps keep you cool on a hot day.

Question

Will give medal. 4. Explain in  how perspiration helps keep you cool on a hot day.

anonymous · Answer

Perspiration evaporates, and draws heat from the body to change state from liquid to gas. Drawing heat from the body helps to cool it down.

anonymous · Answer

Perspiration on your skin keeps you cool due to evaporation. It takes thermal energy to transform liquid into a gas. That thermal (heat) energy has to come from somewhere. Since it's on your skin, the easiest way to transfer heat is conduction - from your skin to the fluid. The skin cools down, the liquid turns to a gas, and floats away. 

And if the area you are in is humid, there is no room for it in the air. So it doesn't evaporate. And you feel hotter. That's why they always say a dry heat isn't as bad as a humid, hot place.