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**PSI**. PSI stands for pounds per square inch, and it’s the measure of air force delivered by the air compressors. For example, a compressor could be rated at 125 psi, which means that it delivers 125 pounds of pressure per square inch.**PSIA**.PSIA is pounds per square inch absolute. Sometimes referred to as total pressure, PSIA refers to pressure relative to zero, or a perfect vacuum.**PSIG**. PSIG is pounds per square gauge, which is a pressure measurement that is measured relative to ambient atmospheric pressure.

PSIG is constantly lower than PSIA. The formulas used to describe the relationship are : PSIA = PSIG + 1 cash machine and PSIG = PSIA – 1 standard atmosphere, where standard atmosphere is atmospheric pressure. Did you know that you can easily calculate PSIA, PSIG, or even convert between the two ? If you know the actual atmospheric atmospheric pressure value for your location, you can use that number in the convention ; alternatively, you can use 14.7 psi, the estimate atmospheric press at sea degree, as a standard value to convert PSIG to PSIA and vice-versa.

Xem thêm: Rims vs. Wheels: What’s the Difference?

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