The constituent particles of amorphous solids have only short range order of arrangement, i.e. regular and periodical arrangement of particles is seen to a short distance only. The structures of amorphous solids are similar to that of liquids. Glass, rubber, plastics, etc., are some of the examples of amorphous solids. Amorphous solid are isotropic in nature, i.e. physical property of amorphous solid are same in all directions.