Thermal Expansion.

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Presentation transcript:

Thermal Expansion

What is thermal expansion? Thermal expansion is the expansion of matter caused by heating.

Remember the two F’s: Particles move faster and farther apart when heated. When a material is heated, it expands. This expansion occurs even when the material does not change its state of matter.

When a material cools, the opposite occurs. The particles move slower and get closer together. The material contracts (gets smaller).

Does thermal expansion occur in solids, liquids and gases? Thermal expansion occurs in all three of these states.

What about water when it changes to ice? This is an exception to our rule for cooling and contraction. Water contracts When it is cooled. However…..

When water is cooled down to freezing point, it suddenly begins to expand and turn into ice. We see this when we pour water into a tray to make ice cubes. We pour in enough so it doesn’t spill over the sides. However, hours later the ice expands to become higher than the tray itself.