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Lect15-ch13ch14_2

# Lect15-ch13ch14_2 - L15Ch13Ch14 Spring 2004 PHY 2053C...

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1 1 Spring 2004 PHY 2053C: College Physics A Today: Kinematic Theory of Gas Idea l Gas Law PV=nRT Maxwe ll d i str but on Interna energy Heat Heat: de f n t Spe c Heat Therma ondu v ty \\ Mot , For e s, Energy Wave s Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle L15—Ch13Ch14 Ideal Gas Law PV nRT Pressure*Volume = no.moles * R * Temp. R =8.315 J/(mol Kelvin) “universal gas constant” =0.0821 (L atm)/(mol K) absolute Temperature is used ! absolute Pressure is used ! What s an dea gas T ? -- well above liquefication point We use: PV (=P 1 V 1 = P 2 V 2 ) = constant (if T and n constant) Boyle's law P/T (=P 1 /T 1 = P 2 /T 2 ) = constant (if V and n constant) Gay-Lussac law

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2 1 You have 1 mole of Hydrogen (atomic mass 2) and 1 mole of O 2 (molecular mass 32), both at atmospheric pressure and room temperature. 1.) Oxygen occupies a larger volume 2.) They occupy the same volume 3.) Helium occupies a larger volume 4.) That depends on the density of the surrounding gas. Question 1 Important points from last Lecture Temperature is related to unordered (random) motion of atoms. Most solid and liquid materials expand and contract with temp ., about 10 -4 ..10 -5 of the total length per 1 ° C.
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Lect15-ch13ch14_2 - L15Ch13Ch14 Spring 2004 PHY 2053C...

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