what is meant by long range and short range order in crystalline and amorphous solids?
Crystalline solids have a long range order which means that there is a regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
Whereas, amorphous solids consist of particles of irregular shape and have short range order only . In such an arrangement, a regular and periodically repeating pattern is observed over short distances only. Such portions are scattered and in between the arrangement is disordered.