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2. Sphere packing - Wikipedia

   en.wikipedia.org/wiki/Sphere_packing

   Sphere packing finds practical application in the stacking of cannonballs.. In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space.

3. Spherical shell - Wikipedia

   en.wikipedia.org/wiki/Spherical_shell

   An approximation for the volume of a thin spherical shell is the surface area of the inner sphere multiplied by the thickness t of the shell: [2] V ≈ 4 π r 2 t , {\displaystyle V\approx 4\pi r^{2}t,}

4. Volume - Wikipedia

   en.wikipedia.org/wiki/Volume

   Some SI units of volume to scale and approximate corresponding mass of water. To ease calculations, a unit of volume is equal to the volume occupied by a unit cube (with a side length of one). Because the volume occupies three dimensions, if the metre (m) is chosen as a unit of length, the corresponding unit of volume is the cubic metre (m 3).

5. Free surface - Wikipedia

   en.wikipedia.org/wiki/Free_surface

   In hydrodynamics, the free surface is defined mathematically by the free-surface condition, [11] that is, the material derivative on the pressure is zero: = In fluid dynamics , a free-surface vortex , also known as a potential vortex or whirlpool, forms in an irrotational flow, [ 12 ] for example when a bathtub is drained.

6. Displacement (fluid) - Wikipedia

   en.wikipedia.org/wiki/Displacement_(fluid)

   Measurement of volume by displacement, (a) before and (b) after an object has been submerged. The amount by which the liquid rises in the cylinder (∆V) is equal to the volume of the object. In fluid mechanics, displacement occurs when an object is largely immersed in a fluid, pushing it out of the way and taking its place. The volume of the ...

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