Low-density viscosity measurements on eight gaseous and vapor mixtures between 297 K and 638 K, originally performed using oscillating-disk viscometers, were re-evaluated after improved re-calibration. The relative combined expanded (k=2\documentclass[12pt]{minimal}
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\begin{document}$$k=2$$\end{document}) uncertainty of the re-evaluated data are 0.2 % near room temperature and increases to 0.3 % at higher temperatures. The re-evaluated data were converted into quasi-isothermal viscosity data. Those for carbon dioxide–ethane, propane–isobutane, and methanol–triethylamine could be used to determine the zero-density and initial density viscosities, ηmix(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _\text{mix}^{(0)}$$\end{document} and ηmix(1)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _\text{mix}^{(1)}$$\end{document}. The ηmix(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _\text{mix}^{(0)}$$\end{document} data for carbon dioxide–ethane agree almost perfectly with viscosity values theoretically computed for the nonspherical potential of the intermolecular interaction. Three procedures were applied to determine the interaction viscosity, ηij(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _{ij}^{(0)}$$\end{document}, and the product of molar density and diffusion, (ρDij)(0)\documentclass[12pt]{minimal}
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\begin{document}$$(\rho D_{ij})^{(0)}$$\end{document}, both in the limit of zero density. In a first procedure only applicable for the three mentioned mixtures, ηij(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _{ij}^{(0)}$$\end{document} values were derived from the ηmix(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _\text{mix}^{(0)}$$\end{document} data additionally requiring Aij∗\documentclass[12pt]{minimal}
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\begin{document}$$A_{ij}^*$$\end{document} values (ratio between effective cross sections of viscosity and diffusion). This procedure should provide the best results when it is possible to use Aij∗\documentclass[12pt]{minimal}
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\begin{document}$$A_{ij}^*$$\end{document} values computed for the nonspherical potential. This was only feasible for carbon dioxide–ethane, for which the experimentally based ηij(0)\documentclass[12pt]{minimal}
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\begin{document}$$\eta _{ij}^{(0)}$$\end{document} and (ρDij)(0)\documentclass[12pt]{minimal}
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\begin{document}$$(\rho D_{ij})^{(0)}$$\end{document} data perfectly agree with theoretically calculated values. For the seven other mixtures, the resulting data represent only preliminary ones. The second and third procedures were applied to the six vapor mixtures methanol with triethylamine, benzene, and cyclohexane and benzene with toluene, p-xylene, and phenol. The resulting data showed a density dependence and were extrapolated to zero density.
