| Crystalline solids |
Amorphous solids |
| They have definite characteristic geometrical shape as constituent particles are arranged in orderly regular long range manner. |
They do not have definite geometrical shape. This is due to short range order of constituent particles. |
| They have sharp melting point. They melt completely at one constant temperature. |
They do not have sharp melting point. As temperature is raised, they gradually soften, becomes less viscous and melt over a temperature range. |
| They are pure solid |
They are supercooled liquid. |
