What do you understand by the term 'absolute pressure'?
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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.
When measuring gauge pressure, current atmospheric pressure is the baseline and is therefore read as 0 PSIG. Any pressure readings taken by a transducer or will be relative to that reference which can change with changes in temperature or altitude. Full vacuum is -14.7 PSIG; or in terms of vacuum pressure, it can also be rendered as +14.7 PSIV.
When measuring gauge pressure, current atmospheric pressure is the baseline and is therefore read as 0 PSIG. Any pressure readings taken by a transducer or will be relative to that reference which can change with changes in temperature or altitude. Full vacuum is -14.7 PSIG; or in terms of vacuum pressure, it can also be rendered as +14.7 PSIV.
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