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A rigid building.

  1. Oct 3, 2008 #1
    Assume a rigid building(assume the building to be like a pyramid and its empty inside) to be vacuum.
    If we open a hole(about r=.5m), then, how long will it take for the air to take up of the whole space apprximately?

    Will, it's just curiosity because I found a little pump in a class room could result in fast moving air in the slit around the door...

    Thank you..

    If the condition is not specific enough, please tell me..
     
    Last edited: Oct 3, 2008
  2. jcsd
  3. Oct 3, 2008 #2

    mathman

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    I won't be able to answer you directly. However you did leave out some important details. First, how big is the building? Second, where is it (on earth - at what altitude?)?
     
  4. Oct 3, 2008 #3
    ... well... we can just assume it to be a orthoprism with length of 100m .
    and emmm at north pole.

    BTW, can you tell me why the altitude matters in this case ?
    Thank you.~
     
  5. Oct 4, 2008 #4

    mathman

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    Air pressure is a function of altitiude, so at higher altitudes the vacuum filling would take longer.
     
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