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Phase Changes
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| 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- At sea level, the boiling point of water is 100 °C (212 °F)- |
| 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 and move freely- |
| Water Vapor | Water in the gas phase- |
| 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- At sea level, the melting point of ice is 0 °C (32 °F)- |
| Phase | A state of matter with certain physical features- |
| 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- |