Measurement of the concentration coefficient of viscosity of mixtures of small concentrations of organic vapour in permanent gases enables the molecular dimensions of organic molecules in the gas phase to be determined and measured with accuracy. The differences in size caused by chainbranching, substitutions, and other structural features are examined. The results are correlated with gas-chromatographically-determined partition coefficients of the vapours between a perfect gas phase and a solution phase in a non-polar solvent.Small concentrations of organic vapours modify the viscosities of permanent gases. We report here studies of dplz/pldxZ (x2+0), where pl is the viscosity of hydrogen or helium, and p12 is the viscosity of the mixture of either gas with a
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