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Thermodynamics of a pure substance at the triple point

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Velasco Maíllo, Santiago and Fernández Pineda, Cristóbal (2007) Thermodynamics of a pure substance at the triple point. American Journal of Physics, 75 (12). pp. 1086-1091. ISSN 0002-9505

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Official URL: http://dx.doi.org/10.1119/1.2779880


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Abstract

A thermodynamic study of a pure substance at the triple point. is presented. In particular, we show that the mass fractions of the phases coexisting at the triple point obey lever rules in the specific entropy-specific volume diagram, and the relative changes in the mass fractions present in each phase along reversible isochoric and adiabatic processes of a pure substance at the triple point are governed by the relative sizes of the segments of the triple-point line in the pressure-specific volume diagram and in the temperature-specific entropy diagram. Applications to the ordinary triple point of water and to the triple point of Al2SiO5 polymorphs are presented.


Item Type:Article
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© 2007 American Association of Physics Teacher. One of the authors (S.V.) acknowledges financial support by the Ministerio de Educación y Ciencia of Spain under Grant Nos. FIS2005-05081 FEDER and FIS2006-03764 FEDER.

Subjects:Sciences > Physics > Thermodynamics
ID Code:22667
Deposited On:21 Nov 2013 10:35
Last Modified:11 Mar 2016 19:11

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