The density expansion of the viscosity coefficient

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Abstract
Experimental viscosity data for gaseous argon, oxygen, and fluorine were analyzed as a function of density and temperature. Necessary conditions were applied to investigate if a given isotherm was consistent statistically with a given density function. It was found that the low temperature isotherms were consistent with the theoretically suggested density function, which involves terms logarithmic in the density. At higher temperatures, however, these logarithmic terms did not appear to be statistically significant.