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Chapter 9 Notes - Chapter 9 Pressure and Velocity...

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1 Chapter 9 Pressure and Velocity Measurements Material from Theory and Design for Mechanical Measurements; Figliola, Third Edition Pressure Pressure is force per unit area. It acts inward or outward, normal to the surface of any physical boundary. Pressure P g = P abs – P o Common “P o ” is P abs at local atmospheric conditions. Absolute pressure will be a positive number. Gauge pressure can be positive or negative depending on the value of measured pressure relative to the reference pressure. A differential pressure, such as p1- p2, is a relative measure and can’t be written as an absolute pressure. Figliola, 2000
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