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Question regarding Bouyancy in Water

  1. Oct 23, 2008 #1
    This has been bugging me for a bit. Take two, identical, rigid containers. Fill one with helium at the level in say... a balloon? Then take the other one, and suck all the air out. Take them to the bottom of a container of water- Which will go up quicker?
     
  2. jcsd
  3. Oct 23, 2008 #2

    mgb_phys

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    Assuming the vacuum one doesn't crush - it will weigh slightly less than the helium one and so rise faster.
    If you could make the envolope strong enough, 'nothing' is the best thing to fill an airship with.
     
  4. Oct 23, 2008 #3
    Thanks. Thought so, but wasn't sure.
     
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