Estes Rockets sells a model rocket fueled by hydrogen generated from water. From the product sheet (
link to PDF):
By passing an electric current (from the six D-size alkaline batteries) through a liquid solution composed of tap water and
citric acid crystals (similar to lemon juice), the water molecule bonds are broken down into the primary elements of hydrogen
and oxygen (this process is called electrolysis and takes place in the Fuel Generator). These separated hydrogen and oxygen
molecules then bubble upward into the plastic ball (Reaction Chamber) where an igniter produces the heat necessary to
ignite the hydrogen fuel. The expanding gases thrust the rocket high into the air. After the hydrogen ignites, it combines with
the oxygen to form the by-product, water!
Link (via Gadget Madness)
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