[gomaaa]

Photons (i.e.light) do have mass. There is an experiment setup that you could buy that looks like a light bulb with a sort of windmill inside of it, that proves it. I'll see if I can find a link.

I don't think photons have mass, as such, but they do have momentum. Please check me on this, as it's been a while since I've had to use these formulas. Einstein's special relativity equation looks like:

E^2 = p^2 * c^2 + m^2 * c^4

where E=energy, p=momentum, m=mass and c= the speed of light. If you have a motionless particle, set p = 0 and you get

E = m * c^2

which everybody knows. If you have a massless particle, like a photon, set m = 0 and you get:

E = p * c

So photons have mass and can do things like run the little fan inside the light bulb (just like air molecules hitting it would transfer momentum and turn the fan, so do photons), if you ever find the link. I couldn't find it either, but I think I know what you're talking about.

PS. Does anyone know if I can use LaTeX equations when posting to FR? Heck, I'll give it a try:

$E^2 = p^2 c^2 + m^2 c^4$

[The_Victor]

Does anyone know if I can use LaTeX equations when posting to FR

I haven't use TeX in 15 years. I'd forgotten what a good program (for its time) that was.

[gomaaa]

Trying again.............

[gomaaa]

E ²= p² c² + m² c⁴




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