What is Dynamic Pressure in Pitot Tube?
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A pitot tube is used for finding velocity at a point in the flow. The pitot tube is measure stagnation pressure and static pressure.
Dynamic pressure = stagnation pressure – static pressure
In other words, dynamic pressure is pressure due to velocity head. See below the figure for a better understanding.
Air has mass (from molecules) and in motion has dynamic energy, which is converted to pressure as the body tries to stop or slow down, is called as dynamic pressure. Generally measured in the tube (pitot) and also comprises static pressure at that pt too.