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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..
Rating Newest Oldest. Best Answer: Psi means pounds (force) per square inch of area. In hydraulics and pneumatics it is usually referred to as gage pressure psig-which is the pressure in reference to atmospheric pressure (usually 14.7 psia) .