In physics, the density of a substance is its mass per unit volume. The symbol for density is ρ (the Greek letter rho). Density is an intensive property, which means it does not depend on the amount of material present. For example, two objects made of the same substance can have different densities if one object has twice as much mass as the other.
Density plays an important role in many real-world applications. For example, knowing the density of water is essential for calculating how much fuel a ship will need to cross an ocean. Densities are also used to calculate how much soil or concrete is needed for a construction project.
The most common unit of density in both SI and customary units is kilograms per cubic meter (kg/m3). However, pounds per cubic foot (lb/ft3) and grams per cubic centimeter (g/cm3) are also sometimes used.
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