Question

what is atmospheric pressure at sea level

Answer 1

Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
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Answer 2

The atmospheric pressure at sea level is 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.