Density, a key material property, quantifies the compactness of matter within a material. It is calculated by dividing mass by volume. This property influences a material’s behavior and applications. Metals, such as aluminum, copper, and gold, exhibit varying densities, influencing their use in industries. For example, aluminum’s low density makes it suitable for lightweight structures, while gold’s high density enhances its value in jewelry and electronics. Understanding the density of different metals enables engineers and designers to select appropriate materials for specific applications.