| Term | Definition |
|---|---|
| Altittude | vertical distance, or elevation, above sea level. |
| Boil | Change from a liquid to a gas. |
| Boiling Point | |
| Condensation | Change from liquid to gas. |
| Deposition | Change from gas to solid. |
| Evaporation | Slow change from liquid to gas. |
| Freeze | Change from a liquid to a solid. |
| Freezing Point | The temperature at which freezing occurs. • At sea level, the freezing point of water is 0°C ( 32°F) |
| Gas | A phase in which matter has no definite shape or volume. |
| Gas Properties | Will expand to fill any container; can be compressed; molecules relatively far apart to move freely. |
| Ice | Water in a solid place. |
| Liquid | A phase in which matter has definite volume but no definite shape. |
| Liquid Proproties | Will take the shape of a container but cannot expand or be compressed; molecules in a liquid move randomly but stay close to one another. |
| Melt | Change from a solid to a liquid. |
| Melting Point | The temperature at which melting occurs. • At sea level, the melting point of ice is 0°(32°F) |
| Phase | A state of matter whit certain physical proprieties. • Solid, liquid, and gas phases occur naturally on Earth. • Plasma is a phase found in the stars. |
| Solid | A phase in which matter has a definite shape and a definite volume. |
| Solid Properties | Will remain the same shape and volume in any container; atoms are held in a rigid structure and cannot move freely. |
| Sublimation | Change from solid to gas |
| Thermal Energy | Energy in the form of heat |
| Vaporization | Rapid change from a liquid to gas. |
| Water Vapor | Water in gas phase. |
