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Chemistry · Glossary

What is Compactness?

Definition 5.7 University Chemistry — Year 1 · Chapter 5 — Crystals I: The Perfect Crystal and Metals

The compactness (or packing fraction) of a crystal of hard spheres is the fraction of the volume occupied by the spheres: for a cell of volume VV containing ZZ spheres of radius RR,

C=Z⋅43πR3V.C = \frac{Z \cdot \frac43 \pi R^3}{V} .
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