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Definition of Gage pressure

Gage pressure Definition from Science & Technology Dictionaries & Glossaries
Technical English by wpv
The pressure above (or below) atmospheric. Represents positive difference between measured pressure and existing atmospheric pressure. Can be converted to absolute by adding actual atmospheric pressure value.
Gage pressure Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
The pressure within a closed container or pipe as measured with a gage. In contrast, absolute pressure is the sum of atmospheric pressure (14.7 lbs/sq in) PLUS pressure within a vessel (as measured by a gage). Most pressure gages read in gage pressure or psig (pounds per square inch gage pressure).