The composition of normal atmospheric air is N2 - 78%, O2 - 21% and other miscellaneous gasses make up the balance. SO,
Any O2 concentration greater than 22-23% would be O2 considered enriched.
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75% nitrogen, 21% oxygen, 3% other gases.
No oxygen in space. We need oxygen.
Sulphur + oxygen = Sulphur Oxide
Because the mass of carbon is not the same as that of oxygen.
Well, for starters, oxygen is used by every living organism for their very essence of life. Humans need oxygen to make energy and plants need carbon dioxide, which contains the element oxygen, to make energy. As a tool, oxygen is very flammable so it is also used in some high-heat related jobs.