What is absolute pressure?

Absolute pressure is the total pressure present in the system

Abs. pressure = Gauge pressure + Atm. pressure.

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Absolute zero = 760 mm Hg Vacuum.

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This is the pressure at standard sea level which is the pressure of the atmosphere around us and is approximately 14.7 pounds per square inch absolute (14.7 Abs. PSIA): this will vary with changes in altitude or weather conditions.