What are solids?
Anything that has a form of its very own and occupies area or has quantity is a solid. An ice dice is a solid. When it melts in to water, it turns in to a liquid that has extent however no specific form. If you pour the liquid in to a spoon, it takes the form of the spoon. If you pour it back in to the ice tray, it takes the form of the ice tray. If the water is heated to a certain temperature, it turns into vapour or fueloline and has no precise form or quantity. Gas expands to fill any box you positioned it into.
