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Phase Change
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). Water boils at lower temperatures at higher altitudes because air pressure is lower. |
Freeze | change from a liquid to 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°) |
Phase | A state of matter with certain physical properties. 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 move freely. |
Ice | Water in the solid phase. |
Thermal Energy | Energy in the form of heat |
Vaporizaton | 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. |