Crookes Radiometer
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Uploaded by bcitphysics on Feb 13, 2008
The Crookes Radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum. Inside the bulb, on a low friction spindle, is a rotor with several vertical lightweight metal vanes spaced equally around the axis. The vanes are polished or white on one side, black on the other. When exposed to sunlight, artificial light, or infrared radiation (even the heat of a hand nearby can be enough), the vanes turn with no apparent motive power, the dark sides retreating from the radiation source and the light sides advancing. Cooling the radiometer causes rotation in the opposite direction.
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@nonmathposn ใช่ๆ ปีนี้ออกเรื่องนี้ข้อนึง เราเข้ามาดูเพราะสงสัย ไม่น่าเชื่อว่าจะมีคนมีโพสต์ 55 5 เธอทำข้อสอบได้เยอะมั้ย
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ข้อสอบมหิดล ปีนี้ มันออก เกรียนมากTT
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doesnt the music suit the radiometer - eh eh lol !!
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its easy to explain,the colored sides receive different amounts of energy.
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@renatadevin Takes energy(heat) to cause motion. Not a sufficient energy source. It would be like using 10 gallons of gasoline to power a light bulb for 5 min(exaggerating).
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tengo un radiometro igual que ese
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Sorry Pete, no photon physics here.
Put the mill in your (dark) freezer and it still works!
The answer you're looking for is called Thermal Transpiration.
The vast majority of ppl can't explain how this device works. In short, there are SOME air particles in a NEAR vacuum that move freely. When the temperature differential inside changes the air molecules get sucked over the perimeter of the vanes like the difference b/w hot and cold air on an airplane wing.
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what do you mean put a turbine on it?
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waw great 6 stars
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Because radiometers only work under artificial conditions... a particular level of atmospheric pressure, on a nearly-frictionless spindle, with a very lightweight set of vanes. The latter two conditions are key. The actual amount of kinetic force generated by this effect is minuscule, pretty much exactly enough to turn the vanes. It couldn't turn anything.
Bruwulf 2 years ago 9
This is probably one of the most difficult phenomenon to explain the particle (photon) theory of light....:) Good vid. Thanks
petersplim 2 years ago 5