The Viscosity of Carbon Dioxide, Methane, and Sulfur Hexafluoride in the Limit of Zero Density

The paper contains accurate representations for the viscosity of the three polyatomic gases, carbon dioxide, methane, and sulfur hexafluoride, in the limit of zero density. These gases were studied because they possess permanent multipole moments of increasing order 4, 6, and 8, respectively. The correlations have associated uncertainties of ±0.3% around room temperature rising to ±1.5% at the low‐temperature extreme and to a maximum of ±2.0% at the high‐temperature extreme. The correlating equation for carbon dioxide is valid for the temperature range 200–1500 K, that for methane from 110–1050 K and that for sulfur hexafluoride from 220–900 K. It is shown that a two‐parameter law of corresponding states is inadequate for the representation of the data over these wide ranges of temperature.