I awoke this morning to a question that foxed me, although I could answer certain points of it. I can understand that fire moves at a very fast rate when consume flamable gases from the fact that it creates a noise that would be similar to an aircraft braking the sound barrier. So it must travel faster than sound, if only with gas. We know that fire emmits heat and light, which can cause nearby solids to be exposed to radiation. This how ever doesn't mean that it spreads the speed of light (or greater). I suppose the only real way of answering it's speed would be to take into consideration what is being burnt and thermodynamics. So does anybody actually have a clue how fast it travels?