below-sea-level surface pressure record of 1081.8 hPa was set on 21 February 1961.

The lowest non-tornadic atmospheric pressure ever measured was 870 hPa, set on 12 October 1979, during Typhoon Tip in the western Pacific Ocean. The measurement was based on an instrumental observation made from a reconnaissance aircraft.

Measurement based on the depth of water

One atmosphere 101.325 kPa is also the pressure caused by the weight of a column

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