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Unformatted text preview: Chapter 14 Fluid A fluid is a collection of molecules that are randomly arranged and held together by weak cohesive forces and by forces exerted by the walls of a container . Both liquids and gases are fluids. The force exerted by a fluid on an object is always perpendicular to the surfaces of the object. The pressure in a fluid can be measured with the device A F P = dA dF P = The SI unit : N/m 2 , Pa (pascal) 1 N/m 2 = 1 Pa Chapter 14 Fluid Variation of Pressure with Depth = = Σ Mg A P PA F y = Ahg A P PA ρ gh P P ρ + = Pa atm P 5 10 103 . 1 00 . 1 × = = Pascal’s law : a change in the pressure applied to a fluid is transmitted undiminished to every point of the fluid and to the walls of the container. The hydraulic press 2 2 1 1 A F A F P = = 1 1 2 2 F A A F = 2 1 1 2 d d A A = The forcemultiplying factor : Chapter 14 Fluid Pressure Measurements gh P P ρ + = P : the absolute pressure PP : the gauge pressure Opentube manometer mercury barometer Chapter 14 Fluid Buoyant Forces and Archimedes’s Principle...
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 Fall '11
 K.Y.Liao
 Fluid Dynamics, Fluid Mechanics, Ideal Fluid Model

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