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Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports , refrigeration and aviation in the United States . It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity .
A pump of this type is capable of producing high vacuum in which the pressure is 1 mPa. [1] The Sprengel pump is a vacuum pump that uses drops of mercury falling through a small-bore capillary tube to trap air from the system to be evacuated. [Note 1] It was invented by Hanover-born chemist Hermann Sprengel in 1865 while he was working in ...
Franck and Hertz's original experiment used a heated vacuum tube containing a drop of mercury; they reported a tube temperature of 115 °C, at which the vapor pressure of mercury is about 100 pascals (about a thousandth of the atmospheric pressure). [1] [12] A contemporary Franck–Hertz tube is shown in the photograph.
A mercury vacuum is a vacuum cleaner specifically designed to collect mercury (the metallic element, not the planet), for instance to clean up spills of the element. It is a requirement of the U.S. EPA that a mercury vacuum cleaner be used to clean up mercury spills (if an alternative method is used, a description of the method must be submitted to the EPA Administrator in a Notification of ...
Mercury oxide–zinc: Mercuric oxide Mercury cell NaOH/ KOH Mercuric oxide: No 1942– [6] 1996 [7] 0.9 [8] 1.35 [8] 0.36–0.44 (99–123) [8] 1.1–1.8 (300–500) [8] 2 [6] Alkaline: Zn/ MnO 2 LR KOH Manganese (IV) oxide: No 1949 [9] 0.9 [10] 1.5 [11] 1.6 [10] 0.31–0.68 (85–190) [12] 0.90–1.56 (250–434) [12] 50 [12] 8.17 (122) [13 ...
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