If pure hydrogen and pure oxygen are both very flammable, why is water not?
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Ultra-ELI5 version: Because water isn’t hydrogen or oxygen.
Point of clarification though, oxygen is not flammable. You could pass a stream of oxygen through a fire where all of the fuel had been consumed already, and it would not increase the temperature at all.
Oxygen will certainly enable combustion (being an oxidizer), but it is not itself a fuel that is consumed.
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