Measuring Vapor Pressure with an Isoteniscope: A Hands-On Introduction to Thermodynamic Concepts

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• 作者：Wenqian Chen ; Andrew J. Haslam ; Andrew Macey ; Umang V. Shah ; Clemens Brechtelsbauer
• 刊名：Journal of Chemical Education
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：93
• 期：5
• 页码：920-926
• 全文大小：409K
• 年卷期：0
• ISSN：1938-1328

文摘

Characterization of the vapor pressure of a volatile liquid or azeotropic mixture, and its fluid phase diagram, can be achieved with an isoteniscope and an industrial grade digital pressure sensor using the experimental method reported in this study. We describe vapor-pressure measurements of acetone and n-hexane and their azeotrope, and how the data can be used to calculate thermodynamic properties of the test liquids, such as the molar heat of vaporization. This hands-on experience allows students to appreciate important thermodynamic concepts such as phase equilibrium, preparing them for more advanced studies of the subject.