I've been reading about hydrogen fuel cells, which basically take water and split the oxygen from the hydrogen. The hydrogen, when mixed with oxygen, is obviously flamable. Is this how they are deriving their power from it then? I was thinking, couldnt this same idea be used for heating homes, much like a furnace? One page even mentioned they had created a torch using this hydrogen.....
But next question, once you've taken H20, and made it into hydrogen and oxygen, then you burn it, is it technically gone forever or what?