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a cgs unit of atmospheric pressure equal to 10--3 bar, 100 newtons per square metre or 0.7500617 millimetre of mercury
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A unit of pressure equal to one-thousandth of a bar. Abbreviated mb. Also known as vac.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A unit of measurement of pressure. In the standard atmosphere, air exerts a pressure of one bar at sea level. A bar is equal to 106 dynes per square centimeter. One bar = 1000 millibars = 750.8 mm Hg = 29.53 in Hg. The average sea level pressure is 1013.2 millibars or 29.92 in of mercury. Altimeter settings used to be given in millibars but now are more likely to be given in hPa (hectopascals). The values of millibars and hectopascals are the same.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved