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Han, Li-Hsin; Shaomin Wu; J. Christopher Condit; Nate J. Kemp; Thomas E. Milner; Marc D. Feldman; Shaochen Chen (2011). "Light-Powered Micromotor: Design, Fabrication, and Mathematical Modeling". Journal of Microelectromechanical Systems. 20 (2): 487–496. doi: 10.1109/JMEMS.2011.2105249. S2CID 11055498. Here is the first edition of The Radio Times, 'the official organ of the BBC', which appeared on news stands on 28 September 1923. It came into existence initially because of the huge resistance from newspapers to the new medium of radio. Faced with the possibility of a press embargo of radio listings, Director-General John Reith decided that the BBC would publish its own listings magazine. Thermodynamic explanation [ edit ] A Crookes radiometer in action with the light switched on and off. (Note that the explanation given in the caption to the clip doesn't agree with the modern explanation.) Movement with absorption [ edit ] World Map Globe, Metal World Map Wall Art, Home Office Decor, Living Room Decor, World Map Hanging, Metal Wall Art, Metal Wall Decor Crookes, William (1 January 1874). "On Attraction and Repulsion Resulting from Radiation". Philosophical Transactions of the Royal Society of London. 164: 501–527. doi: 10.1098/rstl.1874.0015. S2CID 110306977. .Loeb, Leonard B. (1934) The Kinetic Theory of Gases (2nd Edition);McGraw-Hill Book Company; pp 353–386 Bell, Mary; Green, S. E. (1933). "On Radiometer Action and the Pressure of Radiation". Proceedings of the Physical Society. 45 (2): 320–357. Bibcode: 1933PPS....45..320B. doi: 10.1088/0959-5309/45/2/315. . 1933 Bell and Green experiment describing the effect of different gas pressures on the vanes. Ohio, The University of Akron. "the radiometer using inquiry to teach energy conversions". The University of Akron, Ohio . Retrieved 10 October 2021. Typographical home prints - wall decor/wall art/home decor/posters/new home/bedroom/living/kitchen/bathroom/study/office/hallway The currently accepted theory was formulated by Osborne Reynolds, who theorized that thermal transpiration was the cause of the motion. [11] Reynolds found that if a porous plate is kept hotter on one side than the other, the interactions between gas molecules and the plates are such that gas will flow through from the cooler to the hotter side. The vanes of a typical Crookes radiometer are not porous, but the space past their edges behaves like the pores in Reynolds's plate. As gas moves from the cooler to the hotter side, the pressure on the hotter side increases. When the plate is fixed, the pressure on the hotter side increases until the ratio of pressures between the sides equals the square root of the ratio of absolute temperatures. Because the plates in a radiometer are not fixed, the pressure difference from cooler to hotter side causes the vane to move. The cooler (white) side moves forward, pushed by the higher pressure behind it. From a molecular point of view, the vane moves due to the tangential force of the rarefied gas colliding differently with the edges of the vane between the hot and cold sides. [3]

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The prefix " radio-" in the title originates from the combining form of Latin radius, a ray: here it refers to electromagnetic radiation. A Crookes radiometer, consistent with the suffix " -meter" in its title, can provide a quantitative measurement of electromagnetic radiation intensity. This can be done, for example, by visual means (e.g., a spinning slotted disk, which functions as a simple stroboscope) without interfering with the measurement itself. 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. Home decor - Minimal Abstract Line Drawing Kitchen/Dining Room wall prints - set of 3 available in A5, A4, A3 and A2 size. The air pressure inside the bulb needs to strike a balance between too low and too high. A strong vacuum inside the bulb does not permit motion, because there are not enough air molecules to cause the air currents that propel the vanes and transfer heat to the outside before both sides of each vane reach thermal equilibrium by heat conduction through the vane material. High inside pressure inhibits motion because the temperature differences are not enough to push the vanes through the higher concentration of air: there is too much air resistance for "eddy currents" to occur, and any slight air movement caused by the temperature difference is damped by the higher pressure before the currents can "wrap around" to the other side. [6] Movement with radiation [ edit ]Calaprice, Alice; etal. (27 October 2015). An Einstein encyclopedia. Princeton University Press. p.190. ISBN 978-0691141749.