“Matter” Vocabulary 1. Phase- a state in which matter can exist (solid, liquid, gas, plasma). 2. Solid- phase in which matter has a definite shape and volume. 3. Liquid- matter with no definite shape, but with a definite volume. 4. Plasma- phase in which matter is extremely high in energy, and cannot be contained by ordinary matter, very rare on Earth. 5. Crystal- a solid in which the particles are arranged in a regular, repeating pattern. 6. Boiling- process in which particles inside a liquid, as well as, those on the surface of a liquid change to a gas. 7. Boiling Point- the temperature at which a substance changes from the liquid phase to the gas phase. 8. Condensation- change of a gas to a liquid. 9. Evaporationvaporization that takes place at the surface of a liquid. 10. Freezing- change of a liquid to a solid. 11. Freezing Point- the temperature at which a substance changes from the liquid to the solid phase. 12. Melting- change of a solid to a liquid. 13. Melting Point- the temperature at which a substance changes from the solid phase to the liquid phase. 14. Vaporization- change of a liquid to a gas. 15. Sublimation- change from the solid phase directly to the gas phase.