In the youtube video comments there is this great explanation:
"when the matches burn, they heat up the air inside the bottle and release steam n causes the air inside the bottle to expand, forcing some out of the bottle, egg seals the top of the bottle, matches run out of oxygen and go out, the air in bottle cools, volume of air inside the bottle drops due to condensation of the water vapor and the cooling of dry air....exerts less pressure on the egg b/c the air pressure outside of the bottle doesn't change.. overcoming friction :D .."
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