Editing Isentropic process (section)

{{Short description|Thermodynamic process that is reversible and adiabatic}}
{{Thermodynamics|cTopic=[[Thermodynamic system|Systems]]}}

An '''isentropic process''' is an idealized  [[thermodynamic process]] that is both [[Adiabatic process|adiabatic]] and [[Reversible process (thermodynamics)|reversible]].<ref>{{Citation
 | last = Partington
 | first = J. R.
 | author-link = J. R. Partington
 | title = An Advanced Treatise on Physical Chemistry.
 | place = Fundamental Principles. The Properties of Gases, London
 | publisher = [[Longman|Longmans, Green and Co.]]
 | volume = 1
 | year = 1949
 | page = 122}}.
</ref><ref>Kestin, J. (1966). ''A Course in Thermodynamics'', Blaisdell Publishing Company, Waltham MA, p. 196.</ref><ref>Münster, A. (1970). ''Classical Thermodynamics'', translated by E. S. Halberstadt, Wiley–Interscience, London, {{ISBN|0-471-62430-6}}, p. 13.</ref><ref>Haase, R. (1971). Survey of Fundamental Laws, chapter 1 of ''Thermodynamics'', pages 1–97 of volume 1, ed. W. Jost, of ''Physical Chemistry. An Advanced Treatise'', ed. H. Eyring, D. Henderson, W. Jost, Academic Press, New York, lcn 73–117081, p. 71.</ref><ref>Borgnakke, C., Sonntag., R.E. (2009). ''Fundamentals of Thermodynamics'', seventh edition, Wiley, {{ISBN|978-0-470-04192-5}}, p. 310.</ref><ref>Massey, B. S. (1970), ''Mechanics of Fluids'', Section 12.2 (2nd edition) Van Nostrand Reinhold Company, London.  Library of Congress Catalog Card Number: 67-25005, p. 19.</ref>{{Excessive citations inline|date=February 2024}} The [[work (physics)|work]] transfers of the system are [[friction|frictionless]], and there is no net transfer of [[heat]] or [[matter]].   Such an idealized process is useful in engineering as a model of and basis of comparison for real processes.<ref>Çengel, Y. A., Boles, M. A. (2015). ''Thermodynamics: An Engineering Approach'', 8th edition, McGraw-Hill, New York, {{ISBN|978-0-07-339817-4}}, p. 340.</ref> This process is idealized because reversible processes do not occur in reality; thinking of a process as both adiabatic and reversible would show that the initial and final entropies are the same, thus, the reason it is called isentropic (entropy does not change). [[Thermodynamics|Thermodynamic]] processes are named based on the effect they would have on the system (ex. isovolumetric: constant volume, isenthalpic: constant enthalpy).  Even though in reality it is not necessarily possible to carry out an isentropic process, some may be approximated as such.

The word "isentropic" derives from the process being one in which the [[entropy]] of the system remains unchanged. In addition to a process which is both adiabatic and reversible.