Density is considered a derived quantity because it is calculated by dividing two fundamental quantities: mass and volume.
In the International System of Units (SI), mass is measured in kilograms (kg), and volume is measured in cubic meters (m³). Density, denoted by the symbol "ρ" (rho), is defined as the mass of a substance divided by its volume:
Density (ρ) = Mass (m) / Volume (V)
Since mass and volume are fundamental quantities, density is derived from these two measurements. It provides information about how much mass is contained within a given volume of a substance.
It's important to note that derived quantities are expressed in terms of fundamental quantities and their units. In this case, density is expressed in units such as kilograms per cubic meter (kg/m³) in the SI system. These units reflect the relationship between mass and volume, allowing for consistency and comparability in scientific calculations and measurements.
In summary, density is considered a derived quantity because it is calculated by dividing mass by volume, both of which are fundamental quantities in the SI system.