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The activation energy barrier. Combining H atoms and O atoms into water releases a large amount of energy, but breaking up H2 molecules and O2 molecules into H and O atoms requires a large (but not as large) amount of energy. You need to supply sufficient energy to get things started, after which it's generally self-sustaining (and very rapidly so; a stoichiometric mixture of H2 and O2 is quite explosive once ignited).

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