Density, a material property, quantifies the mass per unit volume of a substance. In the case of aluminum, a lightweight metal widely used in aerospace and construction industries, its density is a crucial factor influencing its strength-to-weight ratio. Aluminum has a density of approximately 2.7 g/cm³, which is significantly lower than that of other metals like iron or steel, making it an attractive choice for applications where weight reduction is essential. Understanding the density of aluminum is vital for engineers and material scientists to design and develop products with optimal performance and efficiency.