McLeod gauge

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A vacuum pressure gauge, devised by Herbert McLeod (1841–1923), in which a relatively large volume of a low-pressure gas is compressed to a small volume in a glass apparatus. The volume is reduced to an extent that causes the pressure to rise sufficiently to support a column of fluid high enough to read. This simple device, which relies on Boyle's law, is suitable for measuring pressures in the range 10 3 to 10 −3 pascal.

Subjects: Chemistry.

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