Expansion And Contraction

Question 1

Expansion?

Answer 1

As a substance is heated it gains energy and the particles in the substance move faster, solids vibrate more and liquids and gas particles have higher velocity. Consequently particles move further apart and the substance expands in size.

Question 2

Contraction?

Answer 2

A substance that is cooled looses its energy. Particles move more slowly, move closer together and the substance contracts in size.