Chapter 6.1, Problem 1CSC

Energy Unleashed

Much like a car’s engine, the marathoner’s muscles are only about 20% efficient in converting chemical energy into movement; much of the other 80% is lost as heat. Sweating helps to prevent overheating because the water in sweat absorbs large amounts of heat as it evaporates. But even while Sitting at the computer and doing other non-sweaty activities, we still bum energy, just to stay alive. Where does this energy come from?