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Fluid inside a sphere

  1. Jan 29, 2014 #1
    Hi all!

    Imagine you have an ideal sphere (made of steel or plastics). Then fill it completely with some fluid, e.g. water. Then rotate it very fast. What happens to a fluid inside? I suppose that it will try to change its shape (from spherical to flat). But there is no space for any size changes (the sphere is completely filled). Thank you very much!

    With kind regards,
  2. jcsd
  3. Jan 29, 2014 #2


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    Staff: Mentor

    If the sphere maintains the shape and size exactly, and if the fluid is perfectly incompressible, then the shape does not change. If the fluid is a real, slightly compressible, fluid, and the rotation is really fast, you can get a vacuum* along the rotation axis.

    *more precise: very thin vapor of the liquid
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