Solids are the chemical substances which are characterised by define shape and volume, rigidity, high density, low compressibility. The constituent particles (atoms, molecules or ions) are closely packed and held together by strong interparticle forces
Types of Solids
The solids are of two types : Crystalline solids and amorphous solids.
Distinction Between Crystalline and Amorphous Solids
| S.No | Crystalline solid | Amorphous solids |
| 1 | These have definite and regular arrangement of the constituent particles in space. | These doesn’t have any regular arrangement of the constituent particles in space. |
| 2 | These are true solids. | Theseare super cooled liquids or pseudo soilds. |
| 3 | These have long order arrangement of the particles. | These have short order arrangement of particle. |
| 4 | These are anisotropic in nature, i.e., their physical properties are different in different directions. | These are isotropic in nature i.e., their physical properties are same in all the directions. |
| 5 | They have sharp melting points. | They melt over a certain range of temperature. |
| 6 | They undergo a clean cleavage when cut. | They undergo irregular cleavage when cut. |
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