Solid 

Solid is one of the four forms of matter. Solid does not flow like liquids but all the solids possess the property of elasticity which means that when a deforming force is applied on a solid, it returns to its original position. Since the solids are made up of atoms or molecules, so depending upon their arrangement, they are classified into two categories.

(a)    Crystalline

(b)   Amorphous

Crystalline Solids

The solids in which atoms or molecules are arranged in a definite and a regular manner through out the body of the crystal are known as crystalline solids.

Properties

1. They have definite geometrical shape.
2. They are bounded by flat surface.
3. They are anisotropic i.e. they have different properties in different directions.
4. They have uniform chemical composition.
5. They have sharp melting points.

Amorphous Solids

The solids in which the atoms or molecules are arrangement in an irregular manner are called amorphous solids.

For example: – Graphite, Sulphur etc.

So the total normal force exerted by a liquid at rest on the given surface in contact with it is called the thrust of the liquid on that surface.

Properties

1. They do not have a definite geometrical shape.
2. They are not bounded by flat surface.
3. They are isotropic i.e. they have same properties in different directions.
4. They are of short range.
5. They are of indefinite chemical composition.
6. They do not have sharp melting points

This is the concept of solid, its types and properties.