PIRA 4D20.00 MEAN FREE PATH

DCS #DEMONSTRATIONREFERENCEABSTRACT
4D20.00Mean Free Path
4D20.10Crookes' radiometerPIRA 200The fake radiometer is evacuated until the mean free path is about the dimension of the system.
4D20.10Crookes' radiometer4D20.10The radiometer spins in the wrong direction.
4D20.10radiometerHh-6The fake radiometer is evacuated so the mean free path is about the dimension of the system.
4D20.10radiometerDisc 14-23The radiometer and a lamp.
4D20.11radiometer analysisAJP 45(5),447An "elementary" model for the radiometer at the sophomore level.
4D20.11Crookes' radiometerH-164When the pressure of the Crookes' radiometer is about 1 mm it works well. Place it near dry ice and it will run backwards.
4D20.12Crookes' radiometer backwardsAJP 53(11),1105Put your radiometer in the refrigerator, also try an interesting liquid N2 demo.
4D20.12Crookes' radiometer backwardsAJP 54(9),776Use liquid N2 or freon to cool the radiometer so it will run backwards.
4D20.12Crookes' radiometer backwardsAJP 54(6),490A letter calling attention to the Woodruff (TPT,6,358) article.
4D20.13heating the radiometerAJP 51(7),584Heat the glass of the radiometer until it is motionless and as it cools it will run backwards.
4D20.15calorotorAJP 35(12),1120Vanes rotate in a tube filled with 20 mTorr helium warmed on one end.
4D20.20mean free path and pressurePIRA 1000
4D20.20mean free path and pressureHh-7Aluminum evaporated in high vacuum forms a shadow of a Maltese cross on the side of the bell jar.
4D20.20Maltese Cross27-8.7Evaporating aluminum atoms plate a bell jar except in the shadow of a Maltese Cross.
4D20.30mean free path pin boardPIRA 1000
4D20.30mean free path pinboard27-8.6Steel balls are rolled down a pinboard and the number of collisions is compared with theory.
4D20.31velocity distribution and path lengt10-3.1Take pictures of air table pucks and plot velocity distribution and path length.
4D20.40Boltzmann distribution modelAJP 34(12),1143A set of cusps is formed in a curve with height representing energy levels. The assembly is driven by a shaker.
4D20.45computer Maxwell-BoltzmannAJP 52(1),54A FORTRAN program available from the author that shows the evolution of speed distributions.
4D20.46computer many particle systemsAJP 58(11),1073Computer simulations with a billiard table model and a particle moving in a regular array of hard discs.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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