Abstract
WE have recently experienced instances where, particularly under humid tropical conditions, evacuated and sealed-off apparatus has shown marked deterioration due to the appearance of water vapour inside the evacuated space. While the presence of water vapour can be easily and definitely established, it appears that the channels which allow this transference of water are impervious to air. This means that although the apparatus is, within the limits of our measurements, completely airtight, it nevertheless allows measurable amounts of water vapour to pass into the vacuum.
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References
Allen and Misener, Proc. Roy. Soc., A, 172, 467 (1939).
Allen and Reekie, Proc. Camb. Phil. Soc., 35, 114 (1939); Nature, 144, 475 (1939).
Landau, J. Phys. U.S.S.R., 5, No. 1, 71 (1941).
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REEKIE, J., AIRD, J. Flow of Water Through Very Narrow Channels and Attempts to Measure Thermomechanical Effects in Water. Nature 156, 367–368 (1945). https://doi.org/10.1038/156367a0
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DOI: https://doi.org/10.1038/156367a0
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