I) Stress: Stress is the internal force per unit cross-sectional area that an object experiences when an external force is applied to it. It is a measure of the internal forces acting within

Here are the meanings of the terms:

• i) Stress: Stress is the internal force per unit cross-sectional area that an object experiences when an external force is applied to it. It is a measure of the internal forces acting within a deformable body.
• ii) Strain: Strain is the measure of the deformation of a material in response to an applied stress. It is defined as the change in dimension (e.g., length) divided by the original dimension, and it is a dimensionless quantity.