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Lect04

# Lect04 - Physics 213 September 5 2006 Physics 213 September...

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today: Heat transfer – radiation Ideal gases, kinetic theory Physics 213 September 5, 2006 4.1 Radiation Heat is transferred by electromagnetic radiation (infrared light, visible light, etc .) Heat current is H = Ae ! T 4 Physics 213 September 5, 2006 4.2 Ideal Gases p V = n R T – or – p V = N k T p = gas pressure V = gas volume T = gas temperature n = # of moles of gas N = # of gas molecules R = 8.315 J/(mol•K) k = 1.38 " 10 ! #\$ J/K (gas constant) (Boltzmann’s constant) N=nN A , k=R/N A N A =Avogadro’s # = 6.02 " 10 23 mole -1 T p V Physics 213 September 5, 2006 4.3 Experimental Law: Kinetic Theory • One “point-like” molecule in a box. - mass m - x velocity v x • Collides elastically with walls of box What is the average force that the particle exerts on the right wall. (Hint: recall impulse J=F ! " t) 1. 0 2. can’t tell: need duration of collision 3. mv x 2 /L 4. 2mv x 2 /L 5. mv

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Lect04 - Physics 213 September 5 2006 Physics 213 September...

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