IUPAC definition : short form for amount (of substance) concentration (substance concentration in clinical
chemistry).; group of four quantities characterizing the composition of a mixture with respect
to the volume of the mixture (mass, amount, volume and number concentration).;
short form for amount (of substance) concentration (substance concentration in clinical
chemistry). group of four quantities characterizing the composition of a mixture with respect
to the volume of the mixture (mass, amount, volume and number concentration).