solid - object with a fixed shape., liquid - substance that flows freely., gas - substance that has no fixed shape and particles spread out, mass - another word for weight., volume - amount of space a substance of object takes up., density - mass per unit volume (weight of a substance for a specific volume)., matter - anything that makes up stuff and has volume and weight/mass.., molecules - the smallest particle of a substance (and another name for particles)., particles - a tiny portion, piece/ part of matter (and another name for molecules),

Matter

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