9.2 Uses of metals
- Syllabus
- 0620–2026–2027
- Topic
- 9.2
- Level
- —
Learning objectives
Link metal uses to physical properties
| Metal and use | Required property | Why the property matters |
|---|---|---|
| aluminium in aircraft | low density | reduces aircraft mass |
| aluminium in overhead electrical cables | low density and good electrical conductivity | keeps suspended cables lighter while carrying current |
| aluminium in food containers | resistance to corrosion | prevents rapid reaction with air, water or food |
| copper in electrical wiring | good electrical conductivity and ductility | carries current efficiently and can be drawn into long thin wires |
Answer as a complete causal link: name the material, state the property, then connect it to the use. For example, copper is used for wiring because it conducts electricity well and is ductile, so it can be drawn into wires.
The same metal can be chosen for different reasons. Aluminium's low density controls aircraft and overhead-cable choices; its corrosion resistance controls food-container use; conductivity is additionally essential for cables.
A true property is not automatically a relevant reason. Aluminium's conductivity does not explain a food container, and copper's high density does not explain wiring. Match each stated property to the job it performs.