A Demonstration of the Continuous Phase (Second-Order) Transition of a Binary Liquid System in the Region around Its Critical Point
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[1] Virginia Tech - Wake Forest University
Virginia Tech - Wake Forest University
Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 83, Nº 7, 2006, pág. 1014
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
In most general chemistry and introductory physical chemistry classes, critical point is defined as that temperature–pressure point on a phase diagram where the liquid–gas interface disappears, a phenomenon that generally occurs at relatively high temperatures or high pressures. Two examples are: water, with a critical point at 647 K (critical temperature: Tc) and 215 bar (critical pressure: Pc); and carbon dioxide, with a critical point of 304 K (Tc) and 73 bar (Pc). In colloid chemistry, there is another critical point, which occurs at a specific temperature and mole fraction in a specific binary liquid system where immiscible or partially miscible species become completely miscible. These phenomena of colloidal systems occur at atmospheric pressure and over a temperature range which, for some systems, includes room temperature (~300 K). The purpose of this demonstration is to show this critical-temperature phase-transition phenomenon for a specific binary liquid system, where Tc is ~300 K.
