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elementcollector1
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How exactly does hot iron generate hydrogen?
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Xenoid
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Hydrogen is generated when steam is passed over red hot iron, the iron becoming coated with black magnetite (Fe3O4) in the process!
See Mellor!
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Morgan
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Probably a lot of the noise shown below is from steam vaporization but some unknown amount of oxygen from H20 will react with the hot iron bar. In the
case of the red-hot iron piston diagram shown earlier, the iron would have a charge of compressed air and high temperature steam in a confined space.
A good demonstration would be if you could sustain a yellow heat with iron by having a high pressure/high temperature steam but of lower temperature
flowing over the iron increasing the temperature by the heat of the reaction.
http://books.google.com/books?id=hCgDAAAAMBAJ&pg=PA51&am...
blacksmith anvil shotgun
http://www.youtube.com/watch?v=4FeGkwo8PsQ
Hydrogen from iron and water
http://pubs.acs.org/doi/abs/10.1021/ed009p916
iron-steam
http://www.grantvillegazette.com/articles/Hydrogen__The_Gas_...
Not the same but this demo came to mind - reactions that can happen when you get the temperature up.
http://www.youtube.com/watch?v=O5v3XxFfUOw
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elementcollector1
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I think I get it now. The iron takes oxygen from the water, and forms hydrogen.
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Endimion17
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Or you can say hydrogen was reduced from +1 to 0, and iron was oxidized from 0 to +2 and +3 state.
It's actually one of the well known reactions and essentially the explanation why why water can't be used to extinguish a metal on fire.
It's also the reason why hot nuclear reactor cores must be under water at all times. It's not sufficient to circulate water, there has to be pressure,
too. If you lower the pressure, water boils so badly the rods get trapped in a steam bubble, and their zirconium cladding overheats and starts
reacting, turning brittle and releasing hydrogen which then has to be vented, and if there's catastrophic release of hydrogen, you're one step away
from making an explosion such as the one in Fukushima 1.
That's how Lavoisier was making hydrogen for his experiments, by blowing steam through an iron pipe immersed in fire.
The reaction actually goes in both directions, depending on the conditions. Therefore it's possible to reduce rust to iron powder using hydrogen. In
fact, reagent grade iron powder is made that way. That's why it says "ferrum reductum" on the bottle. 
[Edited on 28-2-2013 by Endimion17]
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KonkreteRocketry
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u will probably need a very high temperature to keep it self in its gas state
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