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Understanding Pressure, Density, and Buoyant Forces in Fluids

Explore the fundamental concepts of pressure, density, and buoyant forces in fluids. Learn how density is calculated as mass divided by volume, and pressure as force divided by area. Understand the buoyant force created by displaced material. Delve into the equations and relationships governing these fluid properties.

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Understanding Pressure, Density, and Buoyant Forces in Fluids

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  1. Physics 2053C – Fall 2001 Chapter 10 Fluids Dr. Larry Dennis, FSU Department of Physics

  2. Pressure and Density • Density = Mass/Volume • Pressure = Force/Area • Buoyant Force is the force created by a displaced material.

  3. Density • Density = Mass/Volume. •  = M/V. • A property of the material. • Density of Water = 1000 kg/m3. • Weight = gV (since M = V).

  4. Pressure • Pressure = Force/Area. • P = F/A. • Depends on the height of the fluid. • Same in all directions. • Units are: • Force/Area = N/m2. • Pascals  1 Pa = 1 N/m2. • Atmosphere  1 atm = 1.013 X 105 N/m2.

  5. Pressure • Pressure = Force/Area. • P = F/A. • Depends on the height of the fluid. F = Mg = (V)g = (  (A*h) )g F/A = (  (A*h) )g / A = gh P = gh

  6. Buoyant Forces • Force exerted by a displaced liquid. Ft-Fb = B gAht - gAhb = B B = gA(ht – hb) = Wt - Wb = B B = A(ht – hb) * g

  7. Next Time • Todd Adams will give lecture on Friday. • Continue Chapter 10. • CAPA Problems. • Please see me with any questions or comments. See you Next Monday.

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