mbar(or hPa)
nominal altitude (ft to nearest 1000 ft; metres to nearest 100 m
100 ...
25 hPa (mbar) or 29.921 inches of mercury (inHg). In aviation weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals, except in the United States and Canada where it is reported in inches of mercury.
Millibar (symbol mb or mbar) is a meteorological unit of pressure equal to one-thousandth of a bar. A bar is a c.g.s.
 See also: Water, Air, Atmosphere, Pressure, Sea level
  
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