# 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
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
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
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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