| Summary: | The thermal conductivity of gases has been the subject of experimental investigations over a period of several decades (54). The thermal conductivity (hereafter simply referred to as the "conductivity"), being, from a physical point of view, one of the basic properties of a gas, much of the classical kinetic theory was concerned with its interpretation. Its measurement was to examine the validity of the theory. The limits of this validity were similar to those imposed on the theory by other gaseous properities, which lead to the concept of the "ideal gas". As to the conductivity, the behaviour of the majority of naturally occuring gases approximated closely that of the "ideal gas" under normal conditions, i.e. at moderate or room temperatures and a pressure range up to atmospheric pressure. Serious deviations from experimental data occured, however, when it was attempted to apply the theory to gases at higher temperatures and pressures.[...]
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