Lec17 - P112Lecture17 Fluids Pressure Objectinfluid atomsbounceoff Units:Pascals=Newtons/meters2 area A patm=1.0

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P112 -- Lecture 17 Fluids
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Pressure Object in fluid: atoms bounce off Each surface feels a force proportional to its area Units: Pascals = Newtons/meters 2 Pressure acts in all directions
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area A Normal atmospheric pressure is: p atm = 1.0 × 10 5 Ν/μ 2 = 14.7 πουνδσ/ινχη 2 . Τηετοταλ φορχε αχτινγδοϖν ονα 1 μ × 2 μτ αβλετοπδυε το τηισαιρπρεσσυρε εθυαλστηε χομ βινεδ ϖειγητο φαβουτηοϖμ ανψπεοπλε? (129 < 1 (229 3 (329 30 (429 300 (529 3000
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Fixed sealed volume Increase density More particles bouncing More pressure Increase temperature Increase average speed of particles Increase momentum transfer in bounce Increase pressure
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Pressure varies with depth Break fluid into small bits A B C δ y Height y
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Pressure varies with depth A B C δ y Take δ y to 0
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Water: density roughly constant -- incompressible Air: density varies with height -- compressible
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This note was uploaded on 04/16/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).

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Lec17 - P112Lecture17 Fluids Pressure Objectinfluid atomsbounceoff Units:Pascals=Newtons/meters2 area A patm=1.0

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