week8-1 - Liquids and Gases The unit of volume is the meter...

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2/28/2011 Physics 214 Fall 2010 1 Liquids and Gases As we know liquids and gases act very differently than solids. Liquids and gases have mass but their constituent atoms are not tightly bound so that each part of the liquid or gas can move. The atoms of a liquid are more tightly bound so a liquid can be kept in an open container whereas gas usually requires a closed container. Liquids, like solids are not very compressible, that is, it is difficult to change the volume. A volume of gas can have it’s volume changed fairly easily. Both have the property of being able to flow, for example water and gas lines in a house. The unit of volume is the meter cubed , m 3 , which is a very large volume. Very often we use cm 3 = cc. Other everyday units are gallons, quarts, pints
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2/28/2011 Physics 214 Fall 2010 2 Density If one takes two objects of exactly the same volume made of different materials they have different weights. So we define a useful quantity Density ρ = mass/unit volume, kg/m 3 or grams/cc so the mass of an object is ρ V and the weight ρ Vg Water: 1 g/cm 3 or 1 ton/m 3 Copper: 8.94 g/cm 3 or 8.94 ton/m 3 Mercury: 13.5 g/cm 3 or 13.5 ton/m 3
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2/28/2011 Physics 214 Fall 2010 3 Pressure We define pressure as P = F/A that is the force divided by the area over which the force acts. Units: 1 N/m 2 = 1 Pa (pascal) Why needle is sharpened at the tip?
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One person applies a 1N force on a square plate with edge length 1 m and push it against the wall. Another person applies a 1N force on a disk of
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This note was uploaded on 04/23/2011 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue.

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week8-1 - Liquids and Gases The unit of volume is the meter...

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