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- ScottLv 41 decade agoFavorite Answer
It would mean that 4% of the air we breathe is hydrogen.
Air is actually a mixture of gases, one of which is hydrogen.
However, 4% seems a bit high. It is actually less than 1%.
Air is about 78% Nitrogen, 21% Oxygen, and 1% "other"
- Anonymous1 decade ago
it means that if you breathe 4% of the air you will die because H2 is pure hydrogen
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