Matching Pairs States of MatterOnline version Vocabulary game featuring states of matter. by Lindsay Carlson 1 2 3 4 5 6 Matter with a definite shape. matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape. Volume is the quantity of three-dimensional space enclosed by a closed surface. the amount of matter in a specific area. takes the shape of its container and can flow. Water is an example. The three states are solid, liquid, and gas. Everything on earth exists in at least one state of matter.