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Kelvin showed the maximum efficiency with which heat can be converted into work; but there is a dual theorem about the maximum efficiency with which heat at one temperature can be converted into heat at another temperature. It has some surprising implications, in particular that the efficiency with which we heat our buildings could in principle be improved by a large factor. This long known, but still little known, fact is of current pedagogical interest and practical importance.

american journal of physics

Comment on “The hidden symmetry for a quantum system with an infinitely deep square-well potential,” by Shi-Hai Dong and Zhong-Qi Ma [Am. J. Phys. <b>70</b> (5), 520–521 (2002)]

Comment on “The hidden symmetry for a quantum system with an infinitely deep square-well potential,” by Shi-Hai Dong and Zhong-Qi Ma [Am. J. Phys. 70 (5), 520–521 (2002)]