Other
Scientific paper
Nov 1949
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1949natur.164..886g&link_type=abstract
Nature, Volume 164, Issue 4177, pp. 886-887 (1949).
Other
Scientific paper
THE mercury filled McLeod gauge presents so far the best absolute instrument and is widely used in the range of low pressures. The presence of mercury vapour in the vacuum system from the gauge itself, however, is one of its serious disadvantages; at normal temperature this pressure is of the order of one micron. This can be remedied in some degree by a liquid-air trap; nevertheless, the use of the trap is rather inconvenient. The use of non-volatile organic fluids1 in the McLeod gauge has the serious disadvantage that many gases are soluble in these fluids; further, the diffusion of the gases through the liquid can influence the accuracy of the measurement. On the other hand, the degassing of dissolved gases from the liquid presents considerable difficulty.
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