What is the Density of Aluminium?

The density of aluminium is approximately 2.7 grams per cubic centimeter (g/cm³) at room temperature. This means that one cubic centimeter of aluminium weighs about 2.7 grams. Density measures how tightly matter is packed inside an object. Aluminium’s density is much lower than that of steel (about 7.8 g/cm³) or copper (8.9 g/cm³), which is why it’s known as a lightweight metal. 

Its low density makes it ideal for industries like aerospace, transportation, and packaging, where reducing weight saves fuel and energy. For example, airplanes and cars use aluminium parts to improve efficiency. 

Despite being light, aluminium has good strength, corrosion resistance, and conductivity. Its atoms are arranged in a face-centered cubic (FCC) crystal structure, giving it flexibility and toughness. 

The density can slightly vary depending on the alloy and temperature—heating causes expansion, reducing density a little. Recycling aluminium doesn’t change its density, which makes it highly sustainable. 

Because of its lightness and strength, aluminium is used in construction, beverage cans, and electrical transmission lines. Understanding its density helps engineers calculate load, design materials efficiently, and ensure that structures remain safe while keeping weight to a minimum.