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This method describes the determination of the relative density 20/20 in air and of the conventional mass per unit volume of industrial glycerins. The relative density 20/20 in air of glycerins is the ratio of the mass in air of a given volume of the glycerins at 20 °C. The conventional mass per unit volume of glycerins is the quotient of its mass in air by its volume. It is expressed in g/mL or in kg/m3. The conventional mass per unit volume of a given substance will vary with temperature. This method is suitable for any solution of glycerol in water. The relative density 20/20 in air is intended primarily for purified glycerins. The method may not be applicable if substances other than water and glycerin are present.