A derived unit of pressure used in meteorology. 1 bar = 1x105 Pa.


An abbreviation for bar gauge, commonly used in engineering. Gauge means that the pressure has been read from a gauge that actually measures the difference between the pressure of the fluid or gas and the pressure of the atmosphere.

decibar (dbar)

One decibar equals 75.006 torr, or 1.450 pounds per square inch (lbf/in2 or psi).

An increase of 1 decibar in pressure in seawater corresponds closely to an increase of 1 metre in depth, this makes it a convenient and often used unit in the measurement of pressure of seawater.

See also: Bar Litre, Pascal, Pressure.

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Subjects: Units