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).