Measurement of Small Differential Pressures at Low Absolute Pressures

Details Measurement of Small Differential Pressures at Low Absolute Pressures Measurement of Small Differential Pressures at Low Absolute Pressures

Oct 1954

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954natur.174..756g&link_type=abstract

Nature, Volume 174, Issue 4433, pp. 756 (1954).

Physics

1

Scientific paper

IN the course of a study of the flow of gases through powders at reduced pressures, it was necessary to be able to measure pressure differences of the order of 1-60 microns mercury in the absolute pressure range 1-100 microns mercury. Such small pressure differences have been measured by using two McLeod gauges, and the method has been reported elsewhere1. It was found that pressure differences of a small order could not be accurately measured using two separate McLeod gauges, even when a cathetometer was used for reading the mercury levels. Consequently, an alternative method and apparatus were developed and their principles are described here.

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