What is a key property of aluminium?

Aluminium is well-known for its corrosion resistance, primarily due to the formation of a thin oxide layer on its surface when exposed to air. This oxide layer protects the underlying metal from further oxidation, effectively preventing rust and degradation. This property makes aluminium an attractive choice for a wide range of applications, including in construction, automotive, and aerospace industries, where materials must endure harsh environments without succumbing to corrosion.

In contrast to the other options, aluminium is not magnetic; it does not possess ferromagnetic properties like iron or steel. While aluminium is relatively lightweight, it is not considered heavy or particularly strong compared to other metals like steel, which is denser and sturdier. Additionally, aluminium is known for its excellent electrical and thermal conductivity, contradicting the idea of low conductivity. These properties contribute to aluminium's versatility and effectiveness in various design and manufacturing applications.