Question

in the differences between amorphous & crystalline solids, what do you mean by short-range order of arrangement of costituent particles & long range order of arrangement of constituent particles?

Answer 1

Long range order- means the arrangement of constituent particles( i.e ions, atom or molecules) is regular. It repeats itself in all direction in three dimensions. This results in definite geometrical shape of crystalline solids. Short range order- It means that regular arrangement of particles is only in small region. This type of arrangement is in amorphous solids.