# 2007-mt2 - Basic terms Static pressure, is the pressure of...

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Lecture Notes by Dr. E.Caner ORHAN Basic terms Static pressure , is the pressure of liquids or gases that are stationary or not in motion. Point A is considered as static pressure although above fluid is flowing. Dynamic pressure , is the pressure exerted by a liquid or gas when it impacts on a surface or an object due to its motion or flow. In figure, the dynamic pressure is (B-A). Impact pressure (total pressure), is the sum of the static and dynamic pressure on a surface or object. Point B depicts the impact pressure.

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Lecture Notes by Dr. E.Caner ORHAN Basic terms Atmospheric pressure , is the pressure on the earth’s surface due to the weight of the gases in the earth’s atmosphere and is normally expressed at sea level. Absolute pressure , is the pressure measured with respect to a vacuum. Gauge pressure , is the pressure measured with respect to atmospheric pressure. atm abs g P P P - =
Lecture Notes by Dr. E.Caner ORHAN Basic terms

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Lecture Notes by Dr. E.Caner ORHAN Basic terms Differential pressure , is the pressure measured with respect to another pressure and is expressed as the difference between the two values. This would represent two points in a pressure or flow system and is referred to as the delta p or Δp. Figure shows two situations, where differential pressure exists across a barrier and between two points in a flow system.
Lecture Notes by Dr. E.Caner ORHAN Classification of instrumentation for pressure measurement According to operational principles; 1. liquid filled pressure instrumentation : “U”-tube manometers, well manometers, bell-type manometers,

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## This note was uploaded on 12/27/2009 for the course PHYS 101 taught by Professor Atillaaydinli during the Fall '09 term at Hacettepe Üniversitesi.

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2007-mt2 - Basic terms Static pressure, is the pressure of...

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