The vapor viscosities of both normal and isopentane have been measured by the rotating cylinder method at different pressures ranging from a few millimeters pressure to the saturated vapor pressures all at 25°C. Twenty-eight measurements are given for normal pentane and thirty-seven for isopentane with an estimated accuracy of 0.2 percent. The plotted values for each compound shows a linear decrease with pressure, the slopes being nearly the same. The results may be expressed for normal pentane η=(677.2-0.0084p)×10^-7 poises; for isopentane η=(696.5-0.0077p)×10^-7 poises where p is the pressure of the vapor in millimeters of mercury.

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vapor viscosities pentane rotating cylinder method

Ralph K. Day,.Variation of the Vapor Viscosities of Normal and Isopentane with Pressure by the Rotating Cylinder Method. 40 (2),281–290.

Ralph K. Day,"Variation of the Vapor Viscosities of Normal and Isopentane with Pressure by the Rotating Cylinder Method" 40

Ralph K. Day,"Variation of the Vapor Viscosities of Normal and Isopentane with Pressure by the Rotating Cylinder Method"