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"In despair, I offer your readers their choice of the following definitions of entropy. My authorities are such books and journals as I have by me at the moment. (a) Entropy is that portion of the intrinsic energy of a system which cannot be converted into work by even a perfect heat engine.--Clausius. (b) Entropy is that portion of the intrinsic energy which can be converted into work by a perfect engine.--Maxwell, following Tait. (c) Entropy is that portion of the intrinsic energy which is not converted into work by our imperfect engines.--Swinburne. (d) Entropy (in a volume of gas) is that which remains constant when heat neither enters nor leaves the gas.--W. Robinson. (e) Entropy may be called the 'thermal weight', temperature being called the 'thermal height.'--Ibid. (f) Entropy is one of the factors of heat, temperature being the other.--Engineering.
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robinson
maxwell
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entropy
definition
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