Respuesta :
displacement is most likely the answer but since I can not see the exact Gizmo this is a guess
Both water and sphere occupy same space which leads to similar volume.
The water volume in the graduated cylinder equals to the spheres volume because both water and the sphere occupies similar space which leads to similar volume of both water and sphere. Both water and sphere displaces to the same point so that's why we can conclude that water volume in the graduated cylinder equals to the sphere's volume.
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