# Lecture17 - PHYSICS 220 Lecture 17 Fluids Textbook Sections 9.1 9.6 Lecture 17 Purdue University Physics 220 1 Overview Lecture 17 States of Matter

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Lecture 17 Purdue University, Physics 220 1 Lecture 17 Fluids Textbook Sections 9.1 - 9.6 PHYSICS 220

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Lecture 17 Purdue University, Physics 220 2 Overview States of Matter Pressure Pascal’s Principle Archimedes’ Principle
Lecture 17 Purdue University, Physics 220 3 States of Matter • Solid – Hold Volume – Hold Shape • Liquid – Hold Volume – Adapt Shape • Gas – Adapt Volume – Adapt Shape Fluids

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Lecture 17 Purdue University, Physics 220 4 Pressure • Force due to molecules of fluid colliding with container. – Impulse = Δ p • Average Pressure = F / A – Scalar – Units: • Pascal (Pa) = N/m 2 • Atmosphere: 1 atm = 101.3 kPa • 1 atm ~ 10 N/cm 2 ~ 15 lb/in 2
Lecture 17 Purdue University, Physics 220 5 y Illustration

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Lecture 17 Purdue University, Physics 220 6 Atmospheric Pressure • Basically weight of atmosphere! • Air molecules are colliding with you right now! • Pressure = 1 × 10 5 N/m 2 = 14.7 lbs/in 2 • Example 1: Plate r = 2.4 in A = π r 2 = 18.1 in 2 F = P A = (14.7 lbs/in 2 )(18.1 in 2 ) = 266 lbs Example 2: Sphere r = 0.1 m A = 4 π r 2 = 0.125 m 2 F = 12,000 N (over 2,500 lbs)!
Lecture 17 Purdue University, Physics 220 7 Atmospheric Pressure You buy a bag of potato chips in Lafayette and forget them (un-opened) under the seat of your car. You drive out to Denver Colorado to visit a friend for Thanksgiving, and when you get there you discover the lost bag of chips. The odd thing you notice right away is that the bag seems to have inflated like a balloon (i.e. it seems much more round and bouncy than when you bought it). How can you explain this ?

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## This note was uploaded on 09/17/2010 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University-West Lafayette.

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Lecture17 - PHYSICS 220 Lecture 17 Fluids Textbook Sections 9.1 9.6 Lecture 17 Purdue University Physics 220 1 Overview Lecture 17 States of Matter

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