| Abstrakt: |
The available viscosity data in the literature have been collected, reduced to a uniform basis, and formulated by means of an empirical equation containing three constants. At very high temperatures, the equation approaches the form of the Sutherland formula. In the case of helium and argon, it was not found possible to represent the data over the whole temperature range of the available measurements with a single set of constants. Attention is called to the fact that the available viscosity data are in many instances known over a sufficiently long temperature range and with an accuracy which requires for its representation a more exact knowledge of the intermolecular field than can be obtained from the application in transport theory of a two-constant field representation. The question of the viscosity of mixtures is discussed briefly, and the use of a theoretical formula deduced by Enskog is illustrated by application to the binary mixtures, hydrogen-carbon dioxide and hydrogen-propane. The formulation of the available heat-conductivity data for the substances listed in the title has been carried out using an equation of the same general form applied for viscosities. A table of formula constants for the substances is given. |
