Air is flowing horizontally at a speed of 100 mph through a duct 4 sq.ft. in cross section. The duct gradually narrows down to a throat section. If a U-tube shows a difference in pressure between the throat and main sections of 7 in. of water, what is the cross-sectional area of the throat? (Assume that the air is non-compressible and has a density of 0.002377 slug per cu ft.)
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
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