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phase changes
Term | Definition |
---|---|
altitude | vertical distance, or elevation, above sea level |
boil | change from liquid to gas |
boiling point | the temperature at which boiling occurs -at sea level, the boiling point of water is 100 °C ( 32 °F ) -water boils at lower temperature at higher altitudes because air pressure is lower there |
freeze | change from 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; con 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 solid to 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 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 defenite shape and 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 |