¹     Did you know that you are made of matter? It's true. Matter is all around us. Matter is anything that takes up space and has mass, or weight. Your body contains and creates three states of matter. Your arms and legs are examples of solids. They have their own shape. Your blood is an example of a liquid. As it flows through your body it takes the shape of your blood vessels. The air that you inhale is a gas. The carbon dioxide that you exhale is one, too. Gasses are the third state of matter.
 
²     It is easy to see a solid. It is easy to see a liquid. It is not always easy, though, to see a gas. A gas does not have its own shape. But it can take on the shape of different containers. If you blow up a round balloon, the air (a gas) will move around and fill it up. If you were to blow up a long and skinny balloon the same thing would happen. This time, though, the air would take on a new shape. It would be long and thin rather than big and round.

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