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Lot of stupid explanations for this in this thread... Yes the fire reacts with the oxygen, but no that is not why the vacuum is created. It doesn't "use up the fuel and create a vacuum". That explanation misses a crucial concept. In any chemical reaction, matter is neither created or destroyed. Its simply changes its structure. Also, CO2 is not less dense than O2. In this context, they are both in gaseous states, therefore their density is variable, depending on the amount of particles in a given space. In this case, the air rising from the candles is very hot. Hot air moves faster, and takes less particles to fill the given space (the glass bottle). When the egg makes a seal with the bottle, cutting off further O2 supply, the fire is extinguished. The source of heat is then gone, the air cools, and condenses. The change in heat is what creates the vacuum. It takes more particles of room temp air to fill that bottle than it does heated particles. . But anywho, this is probably too long and boring for anyone to care to read. Whatever.
Lot of stupid explanations for this in this thread... Yes the fire reacts with the oxygen, but no that is not why the vacuum is created. It doesn't "use up the fuel and create a vacuum". That explanation misses a crucial concept. In any chemical reaction, matter is neither created or destroyed. Its simply changes its structure. Also, CO2 is not less dense than O2. In this context, they are both in gaseous states, therefore their density is variable, depending on the amount of particles in a given space. In this case, the air rising from the candles is very hot. Hot air moves faster, and takes less particles to fill the given space (the glass bottle). When the egg makes a seal with the bottle, cutting off further O2 supply, the fire is extinguished. The source of heat is then gone, the air cools, and condenses. The change in heat is what creates the vacuum. It takes more particles of room temp air to fill that bottle than it does heated particles. . But anywho, this is probably too long and boring for anyone to care to read. Whatever.
Lot of stupid explanations for this in this thread... Yes the fire reacts with the oxygen, but no that is not why the vacuum is created. It doesn't "use up the fuel and create a vacuum". That explanation misses a crucial concept. In any chemical reaction, matter is neither created or destroyed. Its simply changes its structure. Also, CO2 is not less dense than O2. In this context, they are both in gaseous states, therefore their density is variable, depending on the amount of particles in a given space. In this case, the air rising from the candles is very hot. Hot air moves faster, and takes less particles to fill the given space (the glass bottle). When the egg makes a seal with the bottle, cutting off further O2 supply, the fire is extinguished. The source of heat is then gone, the air cools, and condenses. The change in heat is what creates the vacuum. It takes more particles of room temp air to fill that bottle than it does heated particles. . But anywho, this is probably too long and boring for anyone to care to read. Whatever.
It's a result of the fire requiring the oxygen in the air to burn, once it has used up all the oxygen in the sealed bottle the air pressure inside is lower than that outside, however air pressure "likes" to be as even as possible so it sucks in at the weakest point being the egg, as long as the egg isn't massivly fragile it can be sucked it without damage.
#489 to #20
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N. Korean citizen (02/05/2012) [-]
Any idiot who says the "oxygen" gets "used up" is a complete moron and is just spreading ignorance. flames such as in those candles are generated through the exothermic combustion of parrafin wax. CxH2x+2 + xO2 ---> xCO2 + xH2O. There are actually more gas volumes on the right side of the equation and using Le Chatellier's Principle it is not a lack of oxygen, mereley that heated air when cooled occupies less space.
Actually if we want to be completely correct, the flame inside uses all of the fuel (Air) which creates an unbalanced force. The atmosphere outside the bottle actually pushes the egg inside. preparing for a volley of red toenail clippings from people saying "Haha this idiot doesn't know how a vacuum works" but whatever. I don't know why I remember this from school...
Actually if we want to be completely correct, the flame inside uses all of the fuel (Air) which creates an unbalanced force. The atmosphere outside the bottle actually pushes the egg inside. preparing for a volley of red toenail clippings from people saying "Haha this idiot doesn't know how a vacuum works" but whatever. I don't know why I remember this from school...
Actually if we want to be completely correct, the flame inside uses all of the fuel (Air) which creates an unbalanced force. The atmosphere outside the bottle actually pushes the egg inside. preparing for a volley of red toenail clippings from people saying "Haha this idiot doesn't know how a vacuum works" but whatever. I don't know why I remember this from school...