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Monday, December 9, 2013
Definition of Differential Pressure
Differential pressure is a pressure that is measured relative to the pressure in the atmosphere around it. The other type of pressure is absolute pressure, which is measured against absolute zero, but is not often used to measure pressure in real-life scenarios. Rather, instruments measure in differential pressure, which can then be compared to atmospheric pressure to determine whether it is a gauge pressure or a vacuum pressure. A gauge pressure occurs when the measured differential pressure is greater than the atmospheric pressure (), whereas a vacuum pressure is the opposite (). In both equations p is the system's absolute pressure and pa is the atmospheric pressure.
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