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If the kinetic energy within a substance is so low that the attraction between the molecules is much stronger than the forces pulling the molecules apart, the material will be in a solid state of matter. The molecules have some energy but their movement is confined to vibrating or jiggling in place as they are so densely packed. Solid materials have a fixed volume and shape. They are extremely rigid and therefore cannot be easily compressed. Solids also do not flow and cannot easily be joined together with another solid. When a solid is heated to a certain point, it will change to the liquid state of matter.