negative pressure difference measurement

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• Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …   Wikipedia

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• Difference between gauge and absolute pressure — The most common pressure reference is gauge pressure signified by a (g) after the pressure unit e.g. 30 psi g, which means that the pressure measured is the total pressure minus atmospheric pressure. There are two types of gauge reference… …   Wikipedia

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