Density

density ρ

=

mass (kg)   volume (m3)

The units of density are kg m^-3Density is mass per unit volume. It depends on the mass of each particle and how closely the particles are packed.The equation works for mixtures and pure substances. As objects get hotter, they expand, so density decreases with temperature.Density also increases when a substance goes from gas to liquid and liquid to solid.Ice is an exception. Ice is less dense than liquid water.