Meteorology · Atmosphere & Pressure
One millibar (mb) is equal to:
- AOne inch of mercury
- BOne hectopascal (hPa)✓ Correct
- COne pound per square inch
- DOne degree of the Beaufort scale
Explanation
The millibar and the hectopascal are identical units of pressure (1 mb = 1 hPa = 100 pascals). Modern charts may label pressure in either, and they require no conversion between each other.
Authority: Bowditch (Pub. No. 9)
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