We have 5 mechanical processes, CCRRE- something I start to utter when I'm cold. Convection is air ( wind) on the skin speeding up evaporation beyond the optimal exchange to maintain that 98.6 Cody explains. Conduction is the loss of heat through contact with a colder surface. Think of the girl who turned you down for your first dance. Radiation is normal heat loss from the body. Think of it as a gas tank slowly emptied with normal driving and we know needs refilling ( french toast.) Respiration is heat loss through breathing. This is why people from cold climates have different noses from people in hot, at least until we all started dating pretty girls from all over and the irish great grandmother got hot and cold. Evaporation, a scientific term for perspiration AKA sweat: The normal cooling of our body to maintain, once more 98.9 degrees. Speed it up or slow it down and we are in trouble.