Types of Pressure: Definitions
Pressure
-Force per unit area exerted by a fluid
(gas or liquid) on a solid surface.
(gas or liquid) on a solid surface.
Pressure measured relative to an absolute vacuum (absolute zero pressure).
Absolute Pressure
-Gauge Pressure
-Pressure greater than atmospheric pressure that are measured relative to atmospheric pressure. Gauge pressure is the difference between the absolute pressure and atmospheric pressure: Pgauge = Pabs - Patm
Vacuum Pressure
-Pressure less than atmospheric pressure that are measured relative to atmospheric pressure. Vacuum pressure equals atmospheric pressure minus the absolute pressure:
Pvac = Patm - Pabs
Pvac = Patm - Pabs
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