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 the molar fraction of p-D2)k2 yp 2 , with ^=2.17, 2.43, 2.97 -lO" 3 and A:2=2.37, 2.27, 2.24 -lO" 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 ßpp/ß00=1 + (4.37 ± 0.05) • 10-3 , ßop/ßoo = l+ (1-05 ± 0.05) -lO" 3 .A temperature dependence of these ratios was not detected.