0. When both of two systems are in equilibrium with a third, the first two systems are in equilibrium with each other
1. Conservation of Energy - Energy cannot be created or destroyed.
2. Entropy continuously increases.
3. Absolute zero cannot be reached.
1. Energy cannot be created nor destroyed.
2. In a closed system, the potential energy of the state will always be less than that of the initial state.
3. The entropy of all pure perfect crystals is zero at absolute zero. (It is, of course, impossible to get to absolute zero.)