what is absolute pressure?
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Absolute pressure is zero-referenced against a perfect vacuum, so it is equal to gaugepressure plus atmospheric pressure. Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Negative signs are usually omitted.
adeeba6:
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wellcome
Absolute pressure is measured relative to a full vacuum. Alternatively, pressure that is measured against atmospheric pressure (also known as barometric pressure) is called gauge pressure. A full vacuum has an absolute pressure reading of 0 PSIA and average barometric pressure at sea level is ~14.7 PSIA.
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Absolute pressure :
Absolute pressure is a pressure that is relative to the zero pressure in the empty, air-free space of the universe. This reference pressure is the ideal or absolute vacuum. It is denoted with the subscript “abs”: Pabs.
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