Kang D.-Y.Liou K.-H.Chang W.-L.2019-05-222019-05-22201500219584https://scholars.lib.ntu.edu.tw/handle/123456789/409782The expansion or compression of gas confined in a piston-and-cylinder device is a classic working example used for illustrating the First and Second Laws of Thermodynamics. The balance of energy and entropy enables the estimation of a number of thermodynamic properties. The entropy generation (also called entropy production) resulting from this process can also be used to determine the feasibility and reversibility of a process. In this work, we present an extended discussion involving quantitative analysis of the effects of friction between a piston and the interior wall of a cylinder. Our findings indicate that the friction force caused by the movement of the piston is a main source of entropy generation in this process. This explanation does not appear in most textbooks dealing with similar problems. We also discuss, from a quantitative perspective, the effects of friction on the dynamic physical and thermodynamic properties, including entropy generation. Our findings suggest that engaging students in a discussion related to piston-and-cylinder problems involving the effects of friction could provide valuable insight into entropy generation in practical applications. ? 2015 The American Chemical Society and Division of Chemical Education, Inc.Analogies/TransferFirst-Year Undergraduate/GeneralGasesPhysical ChemistrySecond-Year UndergraduateThermodynamicsUpper-Division Undergraduatejournal article10.1021/acs.jchemed.5b003612-s2.0-84944266687https://www.scopus.com/inward/record.uri?eid=2-s2.0-84944266687&doi=10.1021%2facs.jchemed.5b00361&partnerID=40&md5=73868e77a18d32d80803e6db8a4900bc