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I seem to recall that an explanation of this phenomenon that relies on the loss of oxygen through burning is incorrect. Every oxygen molecule lost is replaced by carbon dioxide (and water vapor) so the reaction does not result in a net loss of gases. But when the gas in the bottle becomes hot, it expands and some is lost out of the neck. When the egg seals the bottle and the gas begins to cool the pressure inside the bottle decreases relative to atmospheric pressure and the egg is pushed into the bottle. The video is pretty cool though.
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