Matching metal properties to uses

A metal is suitable for a use when its properties meet the demands of that use. The same property can be useful in different applications, and some applications depend on more than one property.

Aluminium: aircraft, cables and containers

Aluminium has a low density, so a given volume of it has a relatively small mass. This makes aluminium useful in aircraft manufacture, where limiting mass is important.

Overhead electrical cables must carry current without being excessively heavy. Aluminium is suitable because it has good electrical conductivity as well as low density: it conducts current while limiting the cables’ weight.

Aluminium also resists corrosion, making it suitable for food containers.

Copper: electrical wiring

Copper is used in electrical wiring because it conducts electricity well. It is also ductile, meaning it can be drawn out into wires. Its suitability depends on both carrying current and being shaped into wire.