Absolute determination of the thermal conductivity of the noble gases at room temperature up to 35 MPa

The paper presents new absolute measurements of the thermal conductivity of the five noble gases at a nominal temperature of 27.5°C and over a range of pressures. Measurements were made in a transient hot-wire apparatus whose design and operational equations have been published earlier. These values replace the earlier data generated in the same instrument, which has undergone a number of improvements introduced since. The most essential difference is an improved design of the cell, the use of bare platinum wires of 7 μm in diameter, and provision for temperature calibration of electric resistance in situ.