+Packing density measures the proportion of space occupied by objects within a given volume, reflecting the efficiency of their arrangement. It is a fundamental concept across fields, from the close packing of spheres in a [Crystal Structure](/wiki/crystal_structure) to optimizing space in [Containerization](/wiki/containerization).
+## See also
+- [Volume](/wiki/volume)
+- [Density](/wiki/density)
+- [Arrangement](/wiki/arrangement)
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