Answer:
The unit of density is:
Kilograms per cubic centimeter.
Explanation:
We know that the density of a substance is defined as the ratio of the mass of a substance to it's volume.
i.e.

Now, we know that the standard unit of the mass of a substance is: Kilograms(kg)
and the standard unit for a volume is: cubic centimeters(cm³)
Hence, we will get the unit for density as:
Kilograms per cubic centimeter