Aluminium is a chemical element with the atomic number 13 and the symbol Al. It is a lightweight metal that is widely used in various industries due to its unique properties. One of the properties associated with aluminium is its low density.

Low density:
- Aluminium has a low density compared to many other metals. Its density is about one-third that of steel, making it a lightweight material. This property makes aluminium ideal for applications where weight reduction is important, such as in the aerospace industry, where it is used to make aircraft components. The low density of aluminium also makes it easy to transport and handle.

- Due to its low density, aluminium is also used in the production of lightweight vehicles, including cars and bicycles. By using aluminium instead of heavier materials, manufacturers can reduce the overall weight of the vehicle, which can result in improved fuel efficiency and performance.

- The low density of aluminium also makes it an excellent choice for packaging materials. Aluminium foil, for example, is a thin sheet of aluminium that is lightweight and easy to mold. It is used for packaging food and beverages, as well as for insulation and cooking.

- Another advantage of aluminium's low density is its corrosion resistance. Aluminium forms a thin oxide layer on its surface, which protects it from further oxidation. This oxide layer is dense and adherent, preventing corrosion and extending the lifespan of aluminium products.

In summary, aluminium is associated with the property of low density. Its lightweight nature makes it suitable for a wide range of applications, including aerospace, automotive, packaging, and construction. The low density of aluminium also contributes to its corrosion resistance and ease of handling.