High temperature viscosities and intermolecular forces of quasi-spherical molecules

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Abstract
The viscosities of the quasi-spherical molecules CH4, CF4 and SF6 have been measured using a capillary flow technique in the temperature ranges 293–1 050 K (CH4) and 293–873 K (CF4 and SF6). At the lower temperatures the results are generally in reasonable agreement with those reported by other workers but considerable discrepancies exist at higher temperatures. The effect of the new data on previous conclusions regarding interactions between these molecules is discussed.