In
chemistry, the
mass concentration (or
) is defined as the
mass of a constituent
divided by the
volume of the mixture
:
For a pure chemical the mass concentration equals its
density (mass divided by volume); thus the mass concentration of a component in a mixture can be called the density of a component in a mixture. This explains the usage of
ρ (the lower case Greek letter
rho), the symbol most often used for density.