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Observations and Measurement of the Mercury Pumping Effect on Several Gases by Four New Methods

An account is given of several experimental situations that have arisen in our research on thermal accommodation (AC) and tangential momentum accommodation (σ) in which we have been forced to recognize the mercury pumping effect to make sense of our observations. For these, semiquatitative estimates of the magnitude of the pressure increment are extracted from the data. Two methods, introduced by us, for making reliable quantitative measurement of the pressure increments are described and results by one of these are given in some detail. Data on the second method, which senses the pressure increment by a Pirani gauge, should be ready in March, 1974, for the Congress.