A bar was a unit of pressure, nearly identical to the atmosphere. One bar was equal to 100 kilopascals.

Starfleet environmental suits measured oxygen pressure in millibars. (VOY: "Day of Honor")

This unit is used by meteorologists who find it easier to refer to atmospheric pressures without using decimals.

Comparative list of pressures

1,000 millibars = 1 bar
  • While Paris and Torres shared their oxygen, the level dropped from 104 millibars, to 87 millibars, and finally to 71 millibars, before they were rescued by USS Voyager. (VOY: "Day of Honor")
1,000 bars = 1 kilobar

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