>I thought 65% hydrogen + 30+% oxygen would roughly translate to H2O?
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>>I'm not sure where you live, but avoid smoking, or anyone who does - a mix of 65% hydrogen & 30+% oxygen would be extremely explosive. Now if it were 65% nitrogen, you would be much safer (& more likely to be on this planet, which has around 78% nitrogen in the atmosphere & essentially no gaseous hydrogen).
That's the reason it's so explosive - all hydrogen & all oxygen get used up in the resulting bang - so maximum energy released.
Mike
"I can live with doubt and uncertainty and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong." - Richard Feynman