A Venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at speed v₂ through a horizontal section of pipe whose cross-sectional area is A₂ = 0.0721 m². The gas has a density of p = 1.30 kg/m³. The Venturi meter has a cross-sectional area of A₁ = 0.0317 m² and has been substituted for a section of the larger pipe. The pressure difference between the two sections is P2 - P₁ = 86.7 Pa. Find (a) the speed v₂ of the gas in the larger original pipe and (b) the volume flow rate Q of the gas. (a) Number i (b) Number i Hi A1 Lo P₁ Venturi meter Units Units î î
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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