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Old 01-22-2007, 03:30 PM
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Well, for your first question, a vacuum is just a place without any air (or anything else), such as space. Air pressure is how compressed air is in a certain place. if you have a room at normal barometric pressure and you put more air in with a fan, the air pressure will increase. So a vacuum is just a lack of air pressure. The egg is sucked in because the match uses all the oxygen in the bottle. so now you have a bottle with a match which wants oxygen but there is none. meanwhile, outside the bottle all the oxygen in the room have noticed that there is no oxytgen in the bottle. they all want to get in the bottle because the oxygens are crowded. they cant get in through the bottle, so they start pushing on the egg to make it move. result: poof! the egg is sucked in the bottle. it has nothing to do with the atoms getting smaller, if anything the would expand.
For your second question, why not try "Why does the egg get sucked in the bottle when you put a match in the bottle?"
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