Remark
I can explain what is going on, but not in one word. The best word that occurs to me is evaporation. As the sweat evaporates, it "steals" some of the heat energy stored in the skin area helping to keep the body in balance which is what homeostasis means. There is a trigger mechanism at work as well. There are sensors at the skin level that tells the brain to interpret what the temperature change means. It the brain thinks the skin is too warm, it sends out a signal to tell the sweat glands to release moisture. If there is one word for all of that, I don't know what it is.