Density is considered a derived quantity because it is not a fundamental physical property but is instead calculated from other fundamental quantities. In physics, fundamental quantities are the basic properties or measurements that cannot be defined in terms of other physical quantities.
Density is defined as the mass of an object divided by its volume. Mass and volume are both fundamental quantities in physics. Mass represents the amount of matter in an object, while volume represents the amount of space occupied by the object.
By dividing the mass of an object by its volume, we obtain the density of the object. Density is a derived quantity because it is derived from the fundamental quantities of mass and volume. It provides information about how much mass is concentrated within a certain volume of space.
Other derived quantities can be obtained by combining fundamental quantities using mathematical operations or formulas. These derived quantities allow us to describe and understand various aspects of the physical world. In the case of density, it helps us understand the compactness or concentration of mass within a given volume, which is useful in various fields of science and engineering.