Chapter 6

In light of the laws of thermodynamics, explain why you get so much hotter when you run than when you are sitting still.

Which is easier to have: a messy, disordered room or a neat, ordered room? Is the second law of thermodynamics at work in this situation? What is the price of bringing order to a room?

Physicists say that it is impossible to create a perpetual motion machine- -a machine whose own activity keeps it running perpetually. What energy principle precludes the possibility of a perpetual motion machine?