Viscosity for Eight Gaseous and Vapor Mixtures: Revisited from Experiment Between 297 K and 638 K. Final and Preliminary Values for the Interaction Viscosity and for the Product of Molar Density and Diffusion Coefficient in the Limit of Zero Density

Low-density viscosity measurements on eight gaseous and vapor mixtures between 297 K 638 K, originally performed using oscillating-disk viscometers, were re-evaluated after improved re-calibration. The relative combined expanded ( $$k=2$$ ) uncertainty of the data are 0.2 % near room temperature increases to 0.3 at higher temperatures. converted into quasi-isothermal data. Those for carbon dioxide–ethane, propane–isobutane, methanol–triethylamine could be used determine zero-density initial density viscosities, $$\eta _\text{mix}^{(0)}$$ _\text{mix}^{(1)}$$ . dioxide–ethane agree almost perfectly with values theoretically computed nonspherical potential intermolecular interaction. Three procedures applied interaction viscosity, _{ij}^{(0)}$$ , product molar diffusion, $$(\rho D_{ij})^{(0)}$$ both in limit zero density. In a first procedure only applicable three mentioned mixtures, derived from additionally requiring $$A_{ij}^*$$ (ratio effective cross sections diffusion). This should provide best results when it is possible use potential. was feasible which experimentally based calculated values. For seven other resulting represent preliminary ones. second third six methanol triethylamine, benzene, cyclohexane benzene toluene, p-xylene, phenol. showed dependence extrapolated