If you want to use alcohol for physical cooling, you generally have to use an alcohol bath, but not directly with 75% medical alcohol, because the concentration of medical alcohol is too high, you have to use pure water to dilute the alcohol 2-3 times, the concentration of about 25%-30%, before you can take a bath. When the bath will generally choose the forehead, neck, as well as the groin, armpits and other parts, because these parts of the skin is thin, rich in subcutaneous blood vessels, to help the blood in the bath to take away the excess heat. In the alcohol bath must pay attention to keep warm, after rubbing a part to put on clothes, and then rub another part. And alcohol baths are not suitable for the elderly and infirm, infants and children, because the risk of catching a cold is greater, and the speed of lowering body temperature is faster.