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Phase Changes
Flash Cards
Term | Definition |
---|---|
Altitude | vertical distance, or elevation, above sea level |
Boil | change from a liquid to gas |
Boiling point | the temperature at which boiling occurs. • at sea level, the boiling point of water is 100ºC (212ºF) • 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. • at sea level, the freezing point of water is 0ºC (32ºF) |
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 0ºC (32ºF) |
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 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 |