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Boiling, Freezing, Melting Point

Boiling, Freezing, Melting Point

Author: Nathan Lampson

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.

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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:








Boiling point

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 point

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)


Melting point

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)

Boiling, Freezing, Melting Point