Measuremets of the Thermal Transpiration Effects of NO at 90 K and of CO, N2, O2, CH4, and He at 77 K

Abstract

Abstract The thermal transpiration effect of the title gases was measured by a relative method by using a diaphragm-type pressure transducer. The data fit the Takaishi-Sensui equation [P1⁄P2=(AX2+BX+C\sqrtX+\sqrtT1⁄T2)⁄AX2+BX+C\sqrtX+1)] quite well in the region of X(=P2d2) higher than 0.03 mmHg mm. The values for A, B, and C are 25.5, 9.3, and 0.6 for NO at 90 K, 28.5, 10.5, and 0.6 for CO and N2, 24.0, 9.2, and 0.8 for O2, 44.0, 11.4, and 1.2 for CH4, and 2.96, 0.6, and 1.6 for He at 77 k respectively. The values for the temperature-independent constants, A*, B*, and C* deduced from the values for A, B, and C above, were in agreement with the literature values and/or the estimated values.