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Estimation and control of the volume change with integration

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Hi everyone. I am trying to calculate the volume of a sphere. I used Integration in Definition > nonlocal coupling>integration. Then, in derived values I try both Volume intergration and Surface integration. In volume integration, I got an unit = m^6, so I think I made something wrong along the way. In surface Integration, I though it was important to consider the fully geometry in space (I made a 2Axisymmetric model), so I typed 2pirad*intop1(1). Also, in this case the unit is wrong. (rad is the radius of the sphere, I attached below my model).

Can somebody gime me some feedback, or knows if there are another ways to make an estimation of the volume, and eventually, how to control the volume change of the object?

Thanks to all who can help me to understand better. Chiara


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