Definition of density

In physics, the mass per unit volume of a substance is called its density. The symbol ρ (pronounced R instead of U). International master unit? It's kg/m 3 What other commonly used units are there? Grams per cubic centimeter. Its mathematical expression is ρ = m/v. In the international system of units, the main unit of mass is kilogram and the main unit of volume is cubic meter, so the mass of 1 cubic meter is taken as the density of matter. For heterogeneous materials, it is called "average density".