Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Define rigidity.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Rigidity is defined as the property exhibited by the solid to resist change in its shape, i.e. when an external force is applied to the solid material, there won't be any change in the shape.