Isotherms in the Critical Regions of Carbon Dioxide and Sulfur Hexafluoride

Autor:	R. H. Wentorf
Rok vydání:	1956
Předmět:	Gravity (chemistry) Critical phenomena Boundary curve General Physics and Astronomy Thermodynamics Sulfur hexafluoride chemistry.chemical_compound symbols.namesake Critical regions chemistry Constant pressure Carbon dioxide symbols Physical and Theoretical Chemistry van der Waals force
Zdroj:	The Journal of Chemical Physics. 24:607-615
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1742554
Popis:	The p‐v isotherms of carbon dioxide and sulfur hexafluoride have been measured in their critical regions at 0.02°C temperature intervals while the gases were observed and photographed. It was found that the liquid‐vapor boundary curve has a nearly flat top; this renders the classical van der Waals picture of the critical region inadequate. Some slight evidence was found for an anomalous critical region as predicted by Mayer, but this region could be only 0.04°C high for sulfur hexafluoride and less than 0.02°C high for carbon dioxide. It was found that constant pressure is rapidly achieved in the critical region, but that constancy of fluid structure requires five or more hours. The results of these experiments agree well with those of MacCormack and Schneider for sulfur hexafluoride and those of Michels for carbon dioxide. The influence of gravity upon critical phenomena was found to be large. A brief discussion of its effects and corrections to be made on account of it are given.
Databáze:	OpenAIRE
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