What it is:
Well, in my words and what i undersrand Oxygen fuel is like
technology that burns pure oxygen with gaseous fuel. For me is a mix of pure
air and gasoline.
The Hydrogen fuel is a zero-emission fuel which uses uses
electrochemical cells. It is combustion in internal engines. It is used to
power vehicles.
How they use it on the SLS:
They use the Oxygen Fuel and the Hydrogen Fuel to feel the
OV's (Orbiter Vehicle) tank, because like I have said it, they are like
GASOLINE.
Why do they use it on the SLS?
They use it because it is a liquid-fuel cryogenic rocket
engine that was used on NASA's Space Shuttle and is planned to be used on its
successor, the Space Launch System.
How it works in general:
Well in case of the Oxigen Fuel they use it to welding and
cutting. Welding: a welding torch is used to weld metals. Cutting: a torch is
used to heat metal to its kindling temperature.
In case of the Hydrogen fuel, it operates similar to a
battery.
Bibliography:
www.nasa.gov/.../sls
en.wikipedia.org/wiki/Oxy-fuel
en.wikipedia.org/wiki/Hydrogen-fuel
inventors.about.com/od/.../ss/Physics_Illustr_2.htm
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