In school we just started a unit on thermodynamics. So far entropy was only briefly talked about. On first impression it seemed to me that the idea of entropy sort of goes against the definition of energy. Energy being the ability something has to do work, and entropy being energy that isnt available to do work. Doesn't really make sence to me..can anyone explain? Also, if the entropy in a closed sytem is suppost to go up whenever an energy change takes place, wouldn't that go against energy can never be created or destroyed?