Which term describes the measurement of mass per unit volume?

The term that describes the measurement of mass per unit volume is density. Density is defined as the amount of mass contained in a given volume and is typically expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). This concept is crucial in various fields, including aviation, where understanding the density of different materials can affect weight calculations, performance metrics, and material selection for aircraft components.

Weight, while related to mass, refers to the force exerted by gravity on an object and is not a direct measurement of mass per unit volume. Specific gravity compares the density of a substance to the density of a reference substance, usually water, and is dimensionless. Mass simply refers to the quantity of matter in an object and does not incorporate the concept of volume necessary to define density. Thus, density is the most accurate term for this measurement, reflecting the relationship between mass and volume.