Solids can be crystalline (as in metals), noncrystalline (as in plastics), or quasicrystalline (as in metal alloys), depending on the degree of order in the arrangement of the atoms.

• 固体一般分为：晶态（如金属）、非晶态（如塑胶）或准晶态（如合金），取决于原子排列的有序度。