Solids are materials that have definite shape and volume and cannot be compressed upon the application of external pressure.
Solids have high melting points and cannot be deformed easily. Solids melt gradually over a range of temperatures since all the bonds do not break at once.
Solids display a strong force of attraction between the molecules.
Diffusion of a solid into another solid is extremely slow.
They feature tightly packed inter-molecules and hence have more structural rigidity.