[C3H8 + 5 O2 → 3 CO2 + 4 H2O + heat] This is the hydrocarbon combustion of propane, this illustration means for every molecule of propane there needs to be five molecules of oxygen to ignite, which means you can put a match in front of a GBB and it will put the match out (don't try this at home) because there is not enough oxygen to complete the reaction, that said, there is not enough oxygen inside a GBB to facilitate a reaction, even if there is a hot enough spark.
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