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Across 2. A reversible physical change that occurs when a substance changes from one state of matter to another 4. The process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point 6. A description of a change in which a system absorbs energy from it's surroundings 8. The phase change in which a gas or vapor changes directly into a solid without first changing into a liquid 9. The pressure caused by the collisions of particles in a vapor with walls of a container 10. The phase change in which a substance changes from a solid to gas or vapor without changing to a vapor first 11. The energy of a substance must absorb in order to change from a solid to a liquid

Down 1. The energy a substance must absorb in order to change from a liquid into a gas 3. The phase change in which a substance changes from a liquid into a gas 5. The phase in which a substance changes from a gas or vapor to a liquid 7. A description of a change in which a system releases energy to it's surroundings