Amorphous solid, any noncrystalline solid in which the atoms and molecules are not
organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids
and liquids are both forms of condensed matter; both are composed of atoms in close
proximity to each other. But their properties are, of course, enormously different. While
a solid material has both a well-defined volume and a well-defined shape, a liquid has a
well-defined volume but a shape that depends on the shape of the container. Stated
differently, a solid exhibits resistance to shear stress while a liquid does not. Externally
applied forces (in chemistry)