States that energy can neither be created nor destroyed; energy can only be transferred or changes from one form to another.
Third Law
States that as a system becomes more disordered, less of its energy is available to do work, and the entropy of a system can increase or decrease, but the total entropy of the universe is always increasing.
Second Law
States that no machine can transfer all of its absorbed energy as work, the efficiency depends on the amount of energy transferred as heat to and from the source.