Aircraft

Aluminium has low density, so using it reduces aircraft mass and fuel consumption. Pure aluminium is soft, so aircraft structures use strong aluminium alloys. Corrosion resistance also improves service life.

Overhead cables

Aluminium has good electrical conductivity and much lower density than copper. Long cables therefore place less load on pylons. Its ductility allows wire manufacture.

Food containers

Aluminium is used in cans, foil and trays because its oxide layer resists corrosion and it can be shaped easily. Its low density reduces packaging mass.

Property-to-use reasoning

A complete answer states the property and explains why that property matters in the use. “Aluminium is light” is less precise than “its low density reduces aircraft mass”.

High-value recall and connections

Essential recall: Why is aluminium used in aircraft? Its low density reduces mass; suitable alloys are strong and corrosion resistant. Why can it be used in overhead cables? It conducts electricity and has low density. Why does aluminium resist corrosion? A protective oxide layer forms. Practical connection: Given several candidate materials and property data, select the best material for an aircraft panel, power cable and food container and justify each choice. Examination connection: Use the term low density rather than merely “light”.

Review questions and suggested answers