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TeachMeFinance.com - explain Inches of Mercury Inches of Mercury The term 'Inches of Mercury' as it applies to the area of the weather can be defined as ' (or in Hg) Unit of atmospheric pressure used in the United States. The name comes from the use of mercurial barometers which equate the height of a column of mercury with air pressure. One inch of mercury is equivalent to 33.86 millibars or 25.40 millimeters. See barometric pressure. First divised in 1644 by Evangelista Torricelli (1608-1647), an Italian physicist and mathematician, to explain the fundamental principles of hydromechanics. To convert millibars (mb) to inches of mercury (in Hg), divide the millibar reading by 33.86: in Hg = mb / 33.86'. Previous 5 Terms: Incandescent light bulbs, including regular or energy-efficient light bulbs- incarnadine Incentive payments Incentives Demand-Side Management (DSM) program assistance Inch-Degrees Next 5 Terms: Inches of Runoff Incidence Incidence Incident command system Incident response (IR) About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.