Elasticity
Elasticity is that property of matter by virtue of which it offers resistance to an external Force that changes its length or volume or shape. It is the property which brings the body to the original condition when the external force has been moved.
Stress
If a body is made to change in length volume or shape by the application of an external force, the opposing force per unit area which resists such a change is called Stress.
Strain
The fractional deformation which is produced by stress is called the strain.
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