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2. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   A vacuum gauge is used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (for instance, −1 bar or −760 mmHg equals total vacuum). Most gauges measure pressure relative to atmospheric pressure as the zero point, so this form of reading is simply referred to as "gauge pressure".

3. Ultra-high vacuum - Wikipedia

   en.wikipedia.org/wiki/Ultra-high_vacuum

   Ultra-high vacuum (often spelled ultrahigh in American English, UHV) is the vacuum regime characterised by pressures lower than about 1 × 10 −6 pascals (1.0 × 10 −8 mbar; 7.5 × 10 −9 Torr). UHV conditions are created by pumping the gas out of a UHV chamber.

4. Knudsen absolute manometer - Wikipedia

   en.wikipedia.org/wiki/Knudsen_absolute_manometer

   At the heated sides the particles that interact will gain kinetic energy and push to plate to rotation. By reading the speed of this rotation the pressure can be determined. (This is an interpretation from the information about Knudsen manometer from the Dutch book Vacuum Technologie [1])

5. Mercury pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Mercury_pressure_gauge

   Further, the vacuum in the gauge eventually deteriorates due to slow diffusion of gases through the mercury, making the device inaccurate. [8] In 1938, Adolph Zimmerli (1886–1967) [9] invented a gauge that overcame the filling problems, at least for pressures below ambient pressure. [10] Zimmerli's gauge consists of three relatively wide columns.

6. Category:Vacuum gauges - Wikipedia

   en.wikipedia.org/wiki/Category:Vacuum_gauges

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8. Pirani gauge - Wikipedia

   en.wikipedia.org/wiki/Pirani_gauge

   The Pirani gauge consists of a metal sensor wire (usually gold plated tungsten or platinum) suspended in a tube which is connected to the system whose vacuum is to be measured. The wire is usually coiled to make the gauge more compact. The connection is usually made either by a ground glass joint or a flanged metal connector, sealed with an o ...

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