How To Calculate The Volume Of Partially Filled Liquid In Spherical Tank?

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Oddman answered
A "spherical cap" is the volume of a sphere cut off by a plane. The volume can be expressed in terms of the radius (r) of the sphere and the (short) distance (h) from the plane to the sphere.
  Volume = πh^2(r-h/3)

Obviously, if the depth is more than the radius (greater than half full), one can compute the empty volume from this formula and subtract that from the volume of the sphere.

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