What Is the Difference between PSI and Psig?

Answer

In dat sheets either psig or psia is used to denote the pressure.Mere psi is not sufficient to understand the correct value unless a suffix is added as indicated.PSIG refers to psi gauge:normal pressure gauges start with 0 -ignoring the atmospheric pressure.The other unit is psia - psi absolute.This can be stated as :PSIA = psig + 14.6959
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