Abstract
In this paper the authors explain the experimental results, reported earlier, on the error made in measuring pressures below the vapor pressure of mercury with a McLeod gauge. Mercury vapor streaming effects the pressure measurement made by a cold trapped McLeod gauge. The percentage of errors in the pressure measured (i.e., Δp/P2%) agrees with Gaede’s transport theory and Takaishi’s kinetic theory of gas analysis of this problem. Below the vapor pressure of mercury the percentage error starts rising and rises to 10.3% forming a plateau and increases to 17%–19% below 2.67×10−3 Pa (2×10−5 Torr). This increase in pressure measurement error below 2.67×10−3 Pa (2×10−5 Torr) has been found to be in quantitative agreement with that predicted by Rambeau.
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