Matter exists in different states: as a solid, liquid, or gas. Learn about the phase changes of matter, such as freezing from a liquid to a solid, or evaporating from a liquid to a gas. Learn about temperatures at which matter freezes, boils, or melts as it changes from one state to another. Discover the cause of condensation and explore the actions and reactions of molecules in this tutorial.
Matter can exist in the states solids, liquids, or gases
When matter changes between states, it is called a phase change.
Types of phase changes:
The temperature at which liquid begins to boil
Water's boiling point is the temperature of 100 degrees celsius
When water boils, the energy produced by heat will change the phase of water from liquid to gas (evaporation)
Freezing occurs when a liquid changes to a solid.
Water's freezing point is the temperature of 0 degrees celsius
Low temperature cause molecules to move slowly and pack closely together (freezing)
Solid becomes liquid
Water's melting point is the temperature of 0 degrees celsius
When ice melts, the energy produced by heat will change the phase of water from solid to liquid (melting)