Crystalline and Amorphous Solids

Solids are characterised by incompressibility, rigidity and mechanical strength. Solids are usually classified as either crystalline or amorphous. Crystalline solids have definite and ordered arrangement of the constituents extended over a long distance and is called a long-range order. They possess a sharp melting point. Amorphous solids like glass, rubber etc., although possessing many characteristics of crystalline solids such as definite shape, rigidity and hardness, but are devoid of a regular internal structure and melt gradually over a range of temperature. For this reason they are not considered as true solids but rather highly supercooled liquids.
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