University Chemistry ›› 2015, Vol. 30 ›› Issue (4): 74-77.doi: 10.3866/pku.DXHX20150474

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Thermodynamic Analysis on Throttling Expansion of Gases

Hu Xingen, Lin Juanjuan   

  1. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, Zhejiang, China
  • Published:2015-08-14


In this paper, the change of entropy function (S) in the process of gas throttling expansion has been explored. It has been pointed out that the entropy change associated with the throttling expansions of any gases is always positive, and that the process is irreversible. The total thermodynamic characteristics of throttling expansions have been systematically discussed and summarized. The content involved is of importance in the teaching practice for students to gain better insights into the characteristics of the irreversible process, the function of entropy and the principle of entropy increase, as well as the relationships among all thermodynamic functions.

Key words: Gas, Throttling expansion, Joule-Thomson coefficient, Entropy, Thermodynamic characteristics


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