Introduction To Physics: Matter

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There are three different forms, or phases, of matter: solid, liquid, and gas. Solid matter has a definite size and shape that does not change. The volume of liquids is definite, but their shape is determined by the container they occupy. Gases do not have a definite size or shape; they simply expand to fill a container completely. The phases of matter can change. One example is solid ice melting into liquid water; refreeze the water and you have a phase change in reverse.