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What is Absolute Pressure?
When any pressure is detected above the absolute zero of pressure, it is labelled as absolute pressure. It is measured using a barometer, and it is equal to measuring pressure plus the atmospheric pressure.
Absolute pressure formula (pabs) is given by,
Pabs=Patm+Pgauge
where pgauge is the gauge pressure
patm is atmospheric pressure.
The vacuum pressure is articulated as,
Vacuum Pressure = Atmospheric Pressure – Absolute Pressure
At sea level, it is around 14.7 pounds per square inch.