Absolute pressure is equal to gas pressure + atmospheric pressure
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Absolute pressure is zero-referenced against a perfect vacuum, so it is equal to gauge pressure plus atmospheric pressure. Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure.
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When any pressure is detected above the absolute zero of pressure, it is labelled as absolute pressure. It is measured using a barometer, and it is equal to measuring pressure plus the atmospheric pressure. patm is atmospheric pressure. At sea level, it is around 14.7 pounds per square inch.
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