The ratio of the mass of a substance to its volume is called the density. It is a measure of the degree of compactness of a substance.
Density is the ratio of the mass of an object to its volume.
(Mass) / (Volume) of a sample of a substance is known as the density of the substance.
Presumably you mean density which is the mass of a substance divided by its volume. Density = Mass / Volume
Density is the ratio of the mass of a substance to the volume of the substance.