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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 4 Issue 2 (1999) pp 51-57

The Joule-Thomson Coefficient for Pure Gases and Their Mixtures

Jaime Wisniak

Ben-Gurion University of the Negev, Beer-Sheva, Israel 84105

Published online: 2 April 1999

Abstract. The properties of the Joule–Thomson coefficient are discussed in general for pure gases, and the possibility of a nonlinear effect in binary mixtures is analyzed using the First Law of Thermodynamics and some common cubic equations of state. It is shown that although theoretically a binary mixture of gases may exhibit a Joule–Thomson effect different from the molar-weighted mean of the pure-component effects, the possibility of observing a positive difference is very low.

Key Words:  In the Classroom; teaching; thermodynamics; gases; physical chemistry; Joule-Thomson effect

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Issue date: April 2, 1999

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