Which units can describe the density of a substance?

The measurement of density is essential in understanding the physical properties of a substance. Density is defined as mass per unit volume. It indicates how much mass is contained within a specific volume of a substance.

Pounds per cubic foot is a unit of density that is primarily used in the United States. In this system, it reflects the number of pounds of a substance contained in one cubic foot of volume. This makes it an appropriate unit for describing density, especially in contexts where imperial units are prevalent.

Grams per liter and kilograms per cubic meter are also valid units for measuring density. However, the selected answer focuses solely on pounds per cubic foot as the correct choice in this instance.

Moles per liter is a measure of concentration rather than density, referring to the number of moles of a substance within one liter of solution. This is important for chemical contexts but does not directly relate to density in the way that the other units do.

Understanding these various units helps in converting and comparing densities in different contexts, whether in scientific research, engineering applications, or everyday situations.