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Phase Changes
Science Phase Changes Vocabulary
| Term | Definition |
|---|---|
| Altitude | Vertical distance, or elevation, above sea level. |
| Boil | Change from a liquid to a gas. |
| Boiling Point | The temperature at which boiling occurs. |
| Boiling Point (Extra) | At sea level, the boiling point of water is 100°C (212°F). Water boils at lower temperatures at higher altitudes because air pressure is lower there. |
| Freeze | Change from a liquid to a solid. |
| Freezing Point | The temperature at which freezing occurs. |
| Freezing Point (Extra) | 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 and move freely. |
| Water Vapor | Water in the gas form. |
| Liquid | A phase in which matter has definite volume but no definite shape. |
| Liquid Properties | 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. |
| Melting Point (Extra) | At sea level, the melting point of ice is 0 °C (32 °F). |
| Phase | A state of matter with certain physical properties. |
| Phase (Extra) | Solid, liquid, and gas phases occur naturally on Earth. Plasma is a phase found in stars. |
| Solid | A phase in which matter has a definite shape and a definite volume. |
| Solid Properties | Will retain the same shape and volume in any container; atoms are held in a rigid structure and cannot move freely. |
| Ice | Water in the solid phase. |
| Thermal Energy | Energy in the form of heat. |
| Vaporization | Rapid change from liquid to gas. |
| Condensation | Change from gas to liquid. |
| Sublimation | Change from solid to gas. |
| Evaporation | Slow change from liquid to gas. |
| Deposition | Change from gas to solid. |