Pressure relative to atmospheric pressure.
(from the article `pressure gauge`) The reading on a gauge, which is the difference between two pressures, is known as the gauge pressure. If the lower of the pressures is the pressure ...
Pressure measured relative to ambient atmospheric pressure; at sea level, it is 1 atm less than the pressure in the atmosphere. ... Compare: absolute pressure. ... (05 Mar 2000) ... 
Type: Term Definitions: 1. pressure measured relative to ambient atmospheric pressure; at sea level, it is 1 atmosphere less than the pressure in the atmosphere.
Psig. The pressure of a system measured by a gauge, above atmospheric pressure.