Lecture23 - PHYSICS 220 Lecture 23 Kinetic Theory and...

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Lecture 23 Purdue University, Physics 220 1 Lecture 23 Kinetic Theory and Thermal Expansion Textbook Sections: 14.5, 15.3-15.5 PHYSICS 220
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Lecture 23 Purdue University, Physics 220 2 Ideal Gas
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Lecture 23 Purdue University, Physics 220 3 Kinetic Theory L For N molecules, multiply by N Note <KE tr > = ½ m<v 2 > = 3/2m<v x 2 > Using PV = Nk B T
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Lecture 23 Purdue University, Physics 220 4 Kinetic Theory Per molecule Internal energy
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Lecture 23 Purdue University, Physics 220 5 Example • What is the rms speed of a nitrogen N 2 molecule in this classroom? v = 510 m/s = 1150 mph!
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Lecture 23 Purdue University, Physics 220 6 iClicker Suppose you want the rms (root-mean-square) speed of molecules in a sample of gas to double. By what factor should you increase the temperature of the gas? A) 4 B) C) 2
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Lecture 23 Purdue University, Physics 220 7 Maxwell-Boltzmann Distribution How many molecules have speeds in a certain range?
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Lecture 23 Purdue University, Physics 220 8 Collisions between Gas Molecules Mean free path:
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Purdue University, Physics 220 9 Diffusion D … Diffusion constant
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This note was uploaded on 04/23/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University-West Lafayette.

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Lecture23 - PHYSICS 220 Lecture 23 Kinetic Theory and...

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