The diagram below shows the main features of a domestic refrigerator. Study the diagram and answer the questions that follow.
![features of a domestic refrigerator](https://www.easyelimu.com/images/form_4_past_papers/Term_3_2021/Mocks_/physics/features_of_a_domestic_refrigerator.JPG)
State the role of;
- The compressor pump.
- The metal tins.
- The volatile liquid.
- Explain why the freezing compartment is located at the top of the refrigerator.