Stress is a feeling that’s created when we react to particular events.Stress may refer to: Mechanical, Biological, Music, other.
Stress (physics): the average amount of force exerted per unit area.
Yield stress: the stress at which a material begins to deform plastically. Compressive stress: the stress applied to materials resulting in their compaction.
Strain is the deformation of materials caused by the action of stress.
Strain is calculated by first assuming a change between two body states: the beginning state and the final state. Then the difference in placement of two points in this body in those two states expresses the numerical value of strain.
Strain therefore expresses itself as a change in size and/or shape.
If strain is equal over all parts of a body, it is referred to as homogeneous strain; otherwise, it is inhomogeneous strain.