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Home > glossary

customs of Mercury(or in Hg) Unit the atmospheric pressure provided in the unified States. The name comes from the use of mercurial barometers i beg your pardon equate the height of a obelisk of mercury with air pressure. One customs of mercury is equivalent to 33.86 millibars or 25.40 millimeters. Watch barometric pressure. First divised in 1644 by Evangelista Torricelli (1608-1647), an Italian physicist and also mathematician, to explain the basic principles that hydromechanics.To convert millibars (mb) to inches that mercury (in Hg), divide the millibar reading by 33.86:in Hg = mb / 33.86

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