Four Hydrogen atoms, when combined, produce a Helium atom plus a huge amount
of energy.
This process is called Hydrogen fusion, which powers the stars, including
our sun. It produces much more energy than used in the production of
Hydrogen through electrolysis.  However it is not very practical at this
time.  You would need a vessel that could withstand about 100 000 000
degrees Celsius without melting.  Perhaps if Cold Fusion is feasible
(remember the excitement a while back), then all our energy problems would
be solved.  I'm not sure what happened to Cold Fusion research (I'm sure the
oil companies had nothing to do with it).

It is possible, sometime in the far future, peoples vehicles will be powered
by water!

mtcw

Alfred
85 Westy