CLAUSIUS, R. (RUDOLF). - COINING THE WORD "ENTROPY"

Ueber verschiedene für die Anwendung bequeme Formen der Hauptgleichungen der mechanischen Wärmetheorie. (Vorgetragen in der naturfor. Gesellsch. zu Zürich den 24. April 1865).

(Leipzig, Johann Ambrosius Barth, 1865). Without wrappers in "Annalen der Physik und Chemie. Hrsg. von J.C. Poggendorff", Fünfte Reihe Bd.5, Stück 3 (= Poggendorff Bd. 125, No. 9). Pp. 353-512 a. 2 plates (the entire "Heft" (Stück) 3 offered). Clausius's paper: pp. 353-400. Clean and fine.

First printing of this classic paper on the thermodynamical laws in which Clausius coined the word ENTROPY as the short term for his formulation of the second law of thermodynamics. At the end of the paper he concluded in his famous couplet for the two laws of thermodynamics that 1. The energy of the universe is constant. 2. The entropy of the universe tends toward a maximum ("1) Die Energie der Welt ist constant. 2) Die Entropie der Welt strebt einem Maximum zu."(p. 400 in the paper offered). The paper treats the connection between the first and secon law, and deals with the application of entropy to the universe.

"The function which was introduced into thermodynamics by Clausius under the name of entropy had already been used and some of its properties studied by Rankin and Lord Kelvin, but owing to his giving it its name and to his development of its properties it is commonly ascribed to him."(Magie in "A Source Book of Physics", p. 234).

Order-nr.: 43059