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- W2063089006 abstract "The thermal transpiration ratio for helium has been measured by the absolute method with a leached pyrex tube joining the cold and hot regions. Cold temperature was T1=77.4 °K, hot temperature T2=295 °K, pressure range 10−7 to 100 Torr. The results agreed closely with those obtained when an aperture joined the cold and hot regions. In particular, the ideal limiting law P1/P2=(T1/T2)1/2 was found at very low pressures, P1 and P2 being the pressures at T1 and T2 respectively. This result is in contrast to that found with smooth Pyrex tubes where unpredictable deviations from the ideal law were found. It is concluded that leaching the surface produces atomic roughness which forces all reflections to be cosine reflections, leading to the ideal law. The use of a leached tube permits precise thermal transpiration corrections in simple glass apparatus. The glass was leached for 100 h at 100 °C in 0.05 N HCl." @default.
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- W2063089006 date "1969-01-01" @default.
- W2063089006 modified "2023-10-18" @default.
- W2063089006 title "Surface Smoothness in Thermal Transpiration at Very Low Pressures" @default.
- W2063089006 doi "https://doi.org/10.1116/1.1492674" @default.
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