ABSTRACT
In day-to-day life, any material is found in one of the three forms – solid, liquid and gas. A solid has a definite shape and volume. Although it is possible to change the shape of a solid, by application of force, in general, a solid offers significant resistance to the change of its shape. For most of the solids, even after the changed shape, volume remains fairly constant. The molecules in the solids are closely packed and cannot move freely, although they vibrate about their mean position.
