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phase Changes
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. o At sea level, the boiling point of water is 100 °C (212 °F). o 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. o 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. o At sea level, the melting point of ice is 0 °C (32 °F). |
• Phase | a state of matter with certain physical properties. o Solid, liquid, and gas phases occur naturally on Earth. o 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 |