Question

1. when an object is heated it ___________ and when it cools it ________________. If we try to prevent it from contracting , it exerts a large ________________.

2. when things are heated they get bigger because the _______________ are moving more.

3. Explain how a fire alarm works and also draw a diagram

4.Explain why perfume can be smelled some distance away from the person wearing it .

Answer 1

1.expands,contracts

2.molecules