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Gauge pressure refers to the pressure measured relative to atmospheric pressure. It represents the difference between the absolute pressure and atmospheric pressure.
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Absolute Pressure: Absolute pressure is the total pressure exerted by a fluid, including both gauge pressure and atmospheric pressure.
Manometer: A manometer is a device used to measure gauge pressures in fluids.
Vacuum Pressure: Vacuum pressure refers to pressures below atmospheric pressure, where there is less force pushing on an object.