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In standard English: "What does psig mean?"

The abbreviation stands for pounds per square inch gauge.

PSI is a standard unit of pressure, which may be converted to/from Pascals.

"Gauge" here means relative to surrounding atmospheric pressure.

So a reading of 100 psig means a pressure of 100 psi *above* the atmospheric pressure, which is around around 14.7 psi at sea level, making 114.7 psi absolute pressure.

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