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- W2019940258 abstract "We present a physical chemistry laboratory in which students explore phase behavior using subcritical and supercritical fluids. In this experiment, the pressure-dependent dielectric constant of carbon dioxide (CO2) is measured at four temperatures spanning the critical point. For subcritical CO2, the dielectric constant undergoes a striking increase with pressure during condensation, demonstrating the existence of a phase transition. In contrast, the dielectric constant of supercritical CO2 undergoes a systematic increase with pressure demonstrating the absence of a phase transition in the supercritical region. The experiment provides physical chemistry students with a variety of experiences. From a practical standpoint, it allows students to directly use and handle supercritical fluids. From a pedagogical standpoint, the laboratory allows students to develop a cohesive picture of subcritical and supercritical behavior, thereby providing a physical picture of the phenomena schematically depicted in a phase diagram." @default.
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- W2019940258 date "2001-02-01" @default.
- W2019940258 modified "2023-09-26" @default.
- W2019940258 title "Exploring Phase Diagrams Using Supercritical Fluids. An Undergraduate Physical Chemistry Laboratory" @default.
- W2019940258 doi "https://doi.org/10.1021/ed078p241" @default.
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