one thousandth of a bar (1,000 dynes per square centimeter or 100 pascals): 34 millibars equals about one inch of mercury: abbrev. mb
Origin of millibar; from milli- + Classical Greek baros, weight
A unit of atmospheric pressure equal to one thousandth (10−3) of a bar. Standard atmospheric pressure at sea level is about 1,013 millibars.
- A non-SI unit of pressure equal to 100 pascals, used primarily to report atmospheric pressure.