Meteorology · Atmosphere & Pressure
Standard atmospheric pressure at sea level is approximately:
- A1013 millibars (29.92 inches of mercury)✓ Correct
- B850 millibars (25.10 inches of mercury)
- C1100 millibars (33.00 inches of mercury)
- D760 millibars (22.40 inches of mercury)
Explanation
Standard sea-level pressure is 1013.25 mb, equal to 29.92 inches of mercury or 14.7 psi. Readings are compared against this value; well below it indicates a low-pressure system.
Authority: Bowditch (Pub. No. 9)
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