THERMODYNAMICS - KINETIC THEORY - MEAN FREE PATH NC State University Faculty Access

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Crookes Radiometer
# 4D20.10


Description: This radiometer spins in the opposite direction from what theory predicts; the white sides move forward. Turn on the light and watch it spin.

Parts: Radiometer, strong light source

Purchased/Built: purchased

Setup Time: 5 min

Quant. in Demo Room: 1

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 14-23 The radiometer and a lamp.
Freier and Anderson Hh-6 The fake radiometer is evacuated so the mean free path is about the dimension of the system.

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