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PSI and PSIG are both units of measurement for describing the amount pressure a gas or fluid is exerting. However, PSIG specifies what the measurement is relative to, whereas PSI does not. In both units, the letters psi are an abbreviation for pounds per square inch..
Best Answer: psia is pounds per square inch absolute, that is it includes atmospheric pressure. psig is the reading you get on a gauge and is atmospheric pressure (14.7 psi) less. psi is just pounds per square inch and it is appropriate to use this when one is talking about pressure difference. Source(s):