Knight: Chapter 15 Fluids & Elasticity ( Fluids & Pressure)

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Presentation transcript:

Knight: Chapter 15 Fluids & Elasticity ( Fluids & Pressure)

Fluids…  are substances that flow.  take the shape of their container.  include both gases & liquids. Gas.. is compressible. a system in which each molecule moves through space as a free, noninteracting particle until it collides with  another molecule.  the walls of the container. Liquid.. is incompressible.

Volume and density Mass density… “rho” What are the SI units? Exercise for student: convert to

Some Densities… MaterialDensity (kg/m 3 ) Water1000 Air1.28 Ice917 Lead11,350 Gold19,320 Sand2800 You??

i.e. Calculate the mass of the air in this room?

Quiz Question 1 A piece of glass is broken into two pieces of different size. How do their densities compare? 1.  1 >  3 >   1 =  3 =   1 <  3 <  2.

Pressure Pressure, p, is the magnitude of the force exerted perpendicular to a given surface  What are the SI units?  Other units:

Way to measure pressure?

Pressure Two contributions to the pressure in a container of fluid: 1. gravitational due to gravity pulling down on the liquid or gas. 2. thermal due to the collisions of freely moving gas molecules within the walls, which depends on gas temperature.