Some Measurements on the Vapor Viscosities of the Two Common Pentanes, Two Pentenes, and Carbon Tetrachloride

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Abstract
The present work is a continuation of the investigations begun by Dr. R. K. Day on the behavior of vapors by means of accurate viscosity measurements. The instrument, designed and built by him, has been improved, and his results on normal and iso‐pentane have been verified. In addition, measurements on two pentenes, similar in structure to the pentanes, have been made at room temperature, and the viscosity‐pressure curves for all four hydrocarbons and also for CCl4 have been obtained at 100°C. A linear relation, with a negative slope, persists in all these curves, the slope for the hydrocarbons being considerably less at the higher temperature, while the curve for CCl4 is comparable to those for the hydrocarbons at room temperature. Following are the values of the constants in the equation η=η0(1−αp), the pressure being expressed in atmospheres.