Question

why does perspiration keep our body cool

Answer 1

So sweat helps cool you down two ways. First, it makes your skin feelcooler when it's wet. And when it evaporates it removes some heat. ... So your sweat won't evaporate very much because the humid air can't holdvery many more water molecules.

Answer 2

The principle of evaporation is followed by cooling is applied here. Sweat helps in regulating the body temperature when its heated up. With the usage of evaporation,this is achieved.