The document discusses the properties and states of matter. It explains that matter is composed of molecules and can be solid, liquid, or gas. Solids have a definite shape and volume and cannot be compressed, while liquids do not have a definite shape but do have a fixed volume and cannot be compressed. Gases do not have a definite shape or fixed volume and can be compressed. It also defines a solution as a mixture of a solute, the dissolved solid substance, and the solvent, the liquid it dissolves in.