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                         Vocabulary

Expansion: When an object gets bigger from being 

heated

Contraction: When an object gets smaller from being 

cooled

Thermal Energy: Energy an object gets from heat

Kinetic Energy: Energy of a moving object

Particles: Everything is made up of tiny particles too 

small for the naked eye to see, air particles are 

constantly moving and bouncing off of everything.

           The Heating and Cooling of Solids

When a solid is heated it expands, or gets bigger. 

The particles start to move faster and get farther 

apart.

When a solid is cooled it contracts, or gets smaller. 

The particles start to move slower and get closer 

together. 

          The Heating and Cooling of Liquids

When a liquid is heated it expands, which means 

the level of the liquid in it's container will rise. 

The particles move faster and get farther apart. 

When a liquid is cooled it contracts, which means 

the   level of the liquid in it's container will sink. 

The particles move slower and get closer together.

            The Heating and Cooling of Gas

When a gas is heated it expands, meaning the object 

gets bigger. The particles start to move faster and get 

farther apart.

When a gas is cooled it contracts, meaning its gets 

smaller. The particles start to slow down, and come 

closer together, although gas particles never touch.

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