What you mean by packing fraction in 3D?

Space in the unit cell

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Volume of unit cell

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Space occupied by particles/ Total volume of cell.

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Density of particles/Density of cell.

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Solution

The correct option is C
Space occupied by particles/ Total volume of cell.

Packing fraction generally relates to the amount of space occupied inside a unit cell.

A unit cell can be of any dimension. We calculate the packing fraction appropriately.

If a unit cell is in 2-D, we use

Area occupied/Total area of unit cell

If a unit cell is in 3-D, we use

Volume occupied/Total volume of unit cell

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