First law: Heat put into a systemWork done on a system=Increase in internal energy of the system: Second law: A process whose only net result is to take heat from a reservoir and convert it to work is impossible. No heat engine taking heat from and delivering heat at can do more work than a reversible engine, for which The entropy of a system is defined this way: (a) If heat is added reversibly to a system at temperature , the increase in entropy of the system is . (b) At , ( third law ). In a reversible change , the total entropy of all parts of the system (including reservoirs) does not
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