MBAR

an abbreviation for 'millibar', being one-thousandth part of a bar. The 'bar' is the basic unit of atmospheric pressure as defined in the c.g.s. system of measurement (now regarded as obsolete). 1 bar=103 millibars=106 dynes/cm^2 (c.g.s. system)=105 N/m2 (Pa) ( SI system).