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Hydrogen and Oxygen in the ratio 2H to 1O. But they are not both 'in the air'. The atmosphere contains oxygen free from hydrogen; water contain oxygen combined with hydrogen. But there have to be two atoms of hydrogen to one of oxygen and once combined they are fixed; H2O remains the same whether ice, water of steam. If I remember rightly oxygen combines easily with other molecules, hence many things 'rust' which is oxydisation. BWDIK.

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Q: What two gases found in air join to form water moleces?
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