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 States of Matter | The physical forms of matter, which include solid, liquid, gas and plasma |
| Solid | The state of matter in which the volume and the shape of a substance are fixed |
| Liquid | The state of matter which has a definite volume, but not a definite shape |
| Gas | A form of matter that does not have a definite volume or shape |
| Change of State | The change of a substance from one physical state to another |
| Melting | A change of state in which a solid becomes a liquid by adding heat |
| Freezing | The change of state from a liquid to a solid; the reverse process of melting |
| Boiling | The change of a liquid to a vapor or gas throughout the liquid |
| Evaporation | The change of a substance from a liquid to a gas |
| Condensation | The change of state from a gas to a liquid; the reverse process of evaporation |
| Sublimation | The process in which a solid changes directly into a gas |