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Accurate measurements of the thermal conductivities of Ar and He agree with the theoretical value of 2.5 ϕηc   v  ( η = viscosity, c   v  = specific heat capacity at constant volume ϕ is a number slightly greater than 1 depending upon the intermolecular potential). Measurements of the thermal conductivities of N 2 at 9.6 and 75 °C as a function of pressure up to 2.53 × 10 7 Pa help to appraise the validity of other measurements of the thermal conductivities of dense gases. The excess conductivity of nitrogen (the additional conductivity resulting from pressure) is shown to be a function of only the density of the nitrogen from 0 to 700 °C and pressures up to 1.3 × 10 8 Pa.

journal of research of the national bureau of standards. section a. physics and chemistry

Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals