Expansion

1. The increase in volume of matter that occurs when matter is heated.

contraction

expansion

kinetic energy

volume

The decrease in volume of matter that occurs when matter is cooled.

10. In the ball and ring demonstration, the ball was not able to fit through the ring when heated because the particles of the metal...........

Why is it important for engineers to design railroad tracks in a way that it has gaps between rails?

The gaps allow for......... in ........... weather.