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Jul 28, 2008
William Crookes invented his radiometer over 100 years ago, its not new. I've had one of these toys for 20 years from the novelty section of a magic shop. There's a good page on wikipedia explaining how it works and the history: http://en.wikipedia.org/wiki/Crookes_radiometer
Even Albert Einstein had a go at explaining the radiometer. His explanation was that gas molecules hitting the warmer black side pick up heat and speed away, giving the vanes a push. However that doesn't explain the speed with which you can see the vanes move. Osborne Reynolds suggested thermal transpiration where gas molecules move from the cold side of a metal plate to the warm side, creating thrust. Wiki says thatits now believed that both forces move the vanes, but its unknown which is stronger.
Jul 28, 2008
William Crookes invented his radiometer over 100 years ago, its not new. I've had one of these toys for 20 years from the novelty section of a magic shop. There's a good page on wikipedia explaining how it works and the history: http://en.wikipedia.org/wiki/Crookes_radiometer
Even Albert Einstein had a go at explaining the radiometer. His explanation was that gas molecules hitting the warmer black side pick up heat and speed away, giving the vanes a push. However that doesn't explain the speed with which you can see the vanes move. Osborne Reynolds suggested thermal transpiration where gas molecules move from the cold side of a metal plate to the warm side, creating thrust. Wiki says thatits now believed that both forces move the vanes, but its unknown which is stronger. Add something
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This new gadget has just came out of science laboratory and it appears to be very interesting for all the science communities and gadget enthusiasts. The device looking like an electric bulb from the first glance, as a matter of fact is a Crookes
