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### Solids In a solid, molecules are held rigidly in position with virtually no freedom of motion. Many solids are characterized by long-range order; that is, the molecules are arranged in regular configurations in three dimensions. * **Image:** A diagram of a close-packed arrangement of molecu...

### Solids In a solid, molecules are held rigidly in position with virtually no freedom of motion. Many solids are characterized by long-range order; that is, the molecules are arranged in regular configurations in three dimensions. * **Image:** A diagram of a close-packed arrangement of molecules in a solid. The arrangement has long-range order such that the molecules are in regular configurations to form a three-dimensional structure. There is even less empty space in a solid than in a liquid. Thus, solids are almost incompressible and possess definite shape and volume.