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Buoyancy in horisontal pipe

  1. Mar 7, 2010 #1
    Hi people.

    Please explain me, why in a horisontal pipe (closed) a bubble go to middle, and not stay in any other position?

    Also what is the difference of forces when this bubble moves from right/left to middle and when it rise from bottom to top.


    I know bubble rise due to buoyancy, which is equal with pgV. But in horisontal case, this force seems to be less.

    Thanks.
     
  2. jcsd
  3. Mar 8, 2010 #2
    Hello,
    is this question so difficult?? At least, pleas, can someone explain me how spirit level works.
     
  4. Mar 9, 2010 #3

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    The inside of the spirit level pipe is not a perfect cylinder, but rather a barell:
    http://en.wikipedia.org/wiki/Spirit_level
     
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