Determination of Energy and Entropy

Determination of Energy and Entropy
Opening page to Rudolf Clausius' 1875 Determination of Energy and Entropy chapter IX.
In famous publications, “On the Determination of the Energy and Entropy of a Body” is [add]

Overview
In 1866, German physicist Rudolf Clausius, in Schlomilch’s Zeitschrift fur Mathematik und Physik, published a "note" entitled “On the Determination of the Energy and Entropy of a Body”, latter appended to chapter nine of the first edition of his The Mechanical Theory of Heat, wherein, building on the work of German physicist Gustav Kirchhoff, who in prior had done research on the calculation of the energy of bodies, a methodology is set forth on how to calculate and measure both the energy U and entropy S of bodies. [1]

In 1879, Clausius, in the second edition of his The Mechanical Theory of Heat, re-wrote this into a more polished or shall we say textbook presentable format. [2]

Notes
The calculations in this chapter are based on the assumption of reversible processes. In chapter ten, "On Non-Reversible Processes", Clausius clarifies the measure of entropy for irreversible processes.

References
1. Clausius, Rudolph. (1866). “On the Determination of the Energy and Entropy of a Body”, Schlomilch’s Zeitschrift fur Mathematik und Physik, Bd. Xi. S. 31 (note); in (English): Philosophical Magazine, 4(32):1; in: The Mechanical Theory of Heat: with its Applications to the Steam Engine and to Physical Properties of Bodies (§:Appendix to Ninth Memoir, pgs. 366-74). London: John van Voorst.
2. Clausius, Rudolf. (1879). The Mechanical Theory of Heat (chapter IX: "Determination of Energy and Entropy", pg. 195-211). London: Macmillan & Co. (second edition).



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