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In this lesson, you will learn about the states of matter and how they apply to chemistry. We will learn about the solid, liquid, and gas phase, as well as learn about plasma, which is the fourth phase of matter. In the solid phase, atoms are packed close together and have room to vibrate, but cannot move freely past one another. In the liquid phase, the atoms or molecules can slide past each other, which allows us to be able to pour the liquid. In the gas phase, the atoms or molecules can move much more freely and expand with the size of the container. Plasma exists when the electrons are stripped off of that atoms or molecules..