Die Wärmeleitfähigkeiten von reinem Ortho-und Para-Deuteriumgas und ihren Gemischen bei 18,4, 19,6 und 21,0 K / The Thermal Conductivities of Pure Ortho and Pure Para Deuterium Gas and Their Mixtures at 18.4, 19.6 and 21.0 K

Abstract

The results of measurements at three temperatures on gases in the whole concentration range from pure o-D2 to pure p-D2 are presented in the form (γp the molar fraction of p-D2) X/X (rp=0) = 1 - ki yp-.k2 yp2, with ^ = 2 . 1 7 , 2.43, 2.97 - l O " 3 and A:2=2.37, 2.27, 2.24 - l O " 3 for 7 = 18.4, 19.6, 21.0 K respectively. From these coefficients, and making use of the Eucken relation, the ratios of the collision cross sections have been estimated to be Ωpp/Ωoo = 1 + (4.37 ± 0.05) • 10-3, Ωop/Ωoo = 1 + (1-05 ± 0.05) • 1O-3. A temperature dependence of these ratios was not detected