# Lect23 - Physics 101 Lecture 23 Fluids q Today's lecture...

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Physics 101: Lecture 23, Pg 1 Physics 101: Physics 101: Lecture 23 Lecture 23 Fluids Fluids Today’s lecture will cover Textbook Sections 11.1-11.5 Density Pressure Pascal’s Principle

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Physics 101: Lecture 23, Pg 2 Density = Mass/Volume ρ = M/V SI unit: [kg/m 3 ] Densities of somecommon things (kg/m 3 ) Water 1000 ice 917 (floats on water) blood 1060 (sinks in water) lead 11,300 Copper 8890 Mercury 13,600 Aluminum 2700 Wood 550 air 1.29 Helium 0.18 Physics 101: Physics 101: Density Density
Physics 101: Lecture 23, Pg 3 Pressure Pressure Pressure that a fluid or gas exerts on a surface: P = F / A P = F / A SI unit: [N/m SI unit: [N/m 2 = Pa] = Pa] F: force acting perpendicular to surface F: force acting perpendicular to surface A: Area of surface A: Area of surface Atmospheric presure: 1.01 10 1.01 10 5 Pa Pa

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Physics 101: Lecture 23, Pg 4 Pressure and Depth Pressure and Depth Barometer: a way to measure atmospheric pressure Barometer: a way to measure atmospheric pressure p 2 = p 1 + ρ gh p atm = ρ gh Measure h, determine p atm
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