Transformation content

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In thermodynamics, transformation content (TR:35) (LH:1) (TL:36) is a truncated or condensed synonym the following terms and phrases: “equivalence value” (1854), “equivalence value of all uncompensated transformations” (1856), the “disgregation or mode of aggregation of transformations of working substances” (1862), the “entropy” of working bodies (Clausius, 1865), and later the “transformation equivalent” (Maxwell, 1878) of systems; all generally related to the effect of a δQ/T quantified work⇌heat transformation taking place in the system or working body, in relation to the content of th work and heat transformation the molecules of the system do on each other.[1]


The following are quotes:

“We might call S the ‘transformation content’ of the body, just as we termed the magnitude U [internal energy] its ‘thermal’ and ‘ergonal’ content. But as I hold it to be better terms for important magnitudes from the ancient languages, so that they may be adopted unchanged in all modern languages, I propose to call the ‘magnitude’ S the entropy of the body, from the Greek words words η [in or the] + τροπή, meaning in ‘transformation’ (or change) [Verwandlung]. I have intentionally formed the word ‘entropy’ so as to be as similar as possible to the word ‘energy’; for the two magnitudes to be denoted by these words are so nearly allied their physical meanings, that a certain similarity in designation appears to be desirable.”
Rudolf Clausius (1865), Mechanical Theory of Heat (pg. 357) [2]

End matter


  1. Entropy (etymology) – Hmolpedia 2020.
  2. Clausius, Rudolf. (1865). The Mechanical Theory of Heat (translator: Thomas Hirst). Macmillan & Co, 1867.

External links

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