Distinguish between absolute pressure and gauge pressure
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Absolute pressure is the total pressure exerted by a gas or fluid, including the atmospheric pressure. It is measured relative to a vacuum, with zero absolute pressure corresponding to a complete vacuum. Absolute pressure is typically measured in units of pascals (Pa) or pounds per square inch (psi).
Gauge pressure is the pressure of a gas or fluid relative to atmospheric pressure. It is measured by subtracting the atmospheric pressure from the absolute pressure of the gas or fluid. Gauge pressure is typically measured in units of pascals (Pa) or pounds per square inch (psi).