What units of measurement are used to describe density?

The density of an object is equal to the amount of mass it has per unit of volume. As a result, all units of density have to be in the general form of (unit of mass/unit of volume).

The most common one we scientists use is "grams/mL" or "grams/cubic centimeter" (they're the same). When referring to the specific gravity of a substance, these are the units that we with.

When the word density is used by itself it generally means mass density. However, there are many other kinds of density that are used in physics. Frequently they are the amount of something per unit volume, for example charge density measured in coulombs per cubic centimeter. There can also be surface density (charge per unit area, or Coulombs per square meter), and linear density (for example, mass per unit length or kg/m).