| http://www.w3.org/ns/prov#value | - A photon has mass proportional to its energy, and inversely proportional to its wavelength.Those white/black spinny things are called Crookes radiometers, and they do not, in fact, work by the momentum of photons. (This is a common misconception, even among physicists.) They work because the air is heated more on one side of the vane than the other. http://en.wikipedia.org/wiki/Crookes_radiometer
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