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Old 01-19-2007, 03:57 PM
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Default P{LZ HELP with vacuum/air pressure experiment 5th grade..ASAP!!!

Hello,

I am trying to help my son find a topic for a science project. He is in 5th grade and is very bright. We may have narrowed it down and are considering doing a science project on vaccuum/air pressure. Namely the egg in the bottle or water balloon in the bottle experiment. Basically you have a bottle put a match in it and then the egg/water balloon goes on the mouth of the bottle and it eventually gets pulled into the bottle. I have a few questions though before we decide if this is the project for us. So I need anyones/everyones help PLZZZ ASAP!!!

1. Is this project vacuum or air pressure or something different? I have seen it presented as both and am not sure of what the difference is. I know one explained that the fire burns the air making less air inside bottle causing pressure which causes the egg to be pulled iinto the bottle. The other one said something about the molecules being heated up by the match cauing the molecules to go closer or something like that making a vaccuum...I dont know what all this means and which is right...

2. What would make a good question for this experiment...We considered can a bottle be made into a vacuum? or can air pressure alone cause an egg to be sucked into a bottle. We are still unsure about this because we are not sure if air pressure or a vacuum causes the egg to go into the bottle.

We would love any advice or suggestion on how to proceed with this project.

Thanks!!!
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