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Packing factor of a crystal tells us the packing efficiency of the space in which the crystal is present.

The packing factor of 80% will tell us that  around 20 % of space is free or air gaps and the 80% of space is occupied by atoms and sub atomic particles.

Higher packing factor means higher density of the material.  It also means that energy required to melt the material or to vaporize will be more.  The melting point and the boiling points may be higher.

The bonds among the molecules or atoms are stronger if the packing factor is higher.

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