Solids are rigid, because of the relative stronger intermolecular attractions between them as compared to solids and liquids. Those all forces are electrostatic in nature. By supplying heat the increased kinetic energy of the molecules by which we can change the shape or volume of the substance.

Why are solids called rigid?

The atoms and molecules of solids are held together by pulling forces called bonds. The atoms in solids are held together by interatomic forces. ... It is this lack of mobility which makes a solid rigid.

Why solids are rigid and hard?

Solids have a definite volume & shape. They are rigid & lack the ability to flow. This is because the molecules in the solid are very closely packed therefore the intermolecular force among them will be much higher than liquid and gas.