Abstract
Orifice transmission probabilities (defined as the ratio of the number of molecules leaving an orifice into vacuum to the number of molecules entering the orifice from a gas container according to the kinetic theory of gases) have been determined for 15 orifices with length to diameter ratios from 0.02 to 9.53, with a pressure of CsCl vapor from 3.7 × 10−3 to 1.826 torr corresponding to values of the Knudsen number (ratio of mean free path to orifice diameter) from 17.6 to 0.051. Total effusion measurements have been made using both a multiple cell effusion method and a vacuum balance apparatus. The data agree well with previous experimentally determined values, with Clausing orifice transmission probabilities for large K calculated by DeMarcus, and with values calculated from equations derived by Wahlbeck. It is now possible to calculate vapor pressures from transition region data provided the molecular diameter is known.
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