vocabulary:phase changes

Question Answer

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 degree C (212 F)
Water boils at lower temperatures at higher altitude 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 0 degrees C (32 F)
Gas 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 degrees 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 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
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