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Related to absolute pressure: vacuum pressure
absolute pressure[′ab·sə‚lüt ′presh·ər]
The pressure above the absolute zero value of pressure that theoretically obtains in empty space or at the absolute zero of temperature, as distinguished from gage pressure.
The pressure, of a gas or liquid, minus the value of atmospheric pressure.
The pressure measured relative to zero pressure, or a total vacuum, as opposed to gauge pressure, which is pressure measured relative to ambient pressure. A manifold absolute pressure (MAP) gauge measures absolute pressure in a reciprocating engine.