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| Term | Definition |
|---|---|
| State of matter | The physical forms of matter, which include solid, liquid, and gas |
| Solid | The state of matter in which the volume and shape of a substance are fixed. |
| Gas | A form of matter that does not have definite volume or shape. |
| Melting Point | Temperature at which a solid changes to a liquid. |
| Vaporation | Process in which a liquid changes to a gas |
| Boiling Point | The temperature at which a liquid vaporizes and changes to a gas. |
| Condensation | The change of state from gas to liquid. |
| Freezing Point | Temperature at which a solid changes into a liquid. |
| Sublimation | The process in which a solid changes directly into a gas. |
| Phase-Change Diagram | Drawing that shows the relationship among temperature and changes of state. |
| Plasma | A state of matter that forms when temperatures are enough to completely remove electrons from the atoms to which they were bound. |