In thermodynamics, isentropic refers to a line on diagram or graph of equal entropy.

The term was coined in 1873 by American engineer Willard Gibbs and approved of and adopted by German physicist Rudolf Clausius in 1875. [1]

In 1875, James Maxwell was using the term ‘isentropic’ as a synonym or thematic to William Rankine's 1859 term adiabatic. [1]

1. (a) Gibbs, J. Willard. (1873). "Graphical Methods in the Thermodynamics of Fluids" (pg. 3), Transactions of the Connecticut Academy, I. pp. 309-342, April-May.
(b) Clausius, Rudolf. (1879). The Mechanical Theory of Heat (pg. 68). London: Macmillan & Co.
2. Maxwell, James. (1875). “Letter to James Thomson”, July 8th; in The Scientific Letters and Papers of James Clerk Maxwell (pgs. 230-31). Volume 3; 1874-1879.

External links
‚óŹ Isentropic process – Wikipedia.

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