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Work and Heat Are Two Different Forms of Energy Transferred Between Two Different Bodies
quantum theory could get around carno's bound, but so far it has not been broken. Work and heat are the two types of energy that are being transferred between two different bodies. You can directly harness work to push a rock up a hill or charge a battery. Whereas is random energy, so it's uncoordinated. It's not doing something useful. Although if you wanted to, then you could use it in conjunction with an engine to do something worse useful, to turn it into work.