What term describes the relationship of an object's mass to its volume?

The term that describes the relationship of an object's mass to its volume is density. Density is defined as the mass of an object divided by its volume, often expressed in units like grams per cubic centimeter (g/cm³) or kilograms per liter (kg/L). This relationship provides insight into how compact or spread out the matter within an object is. Understanding density is crucial in various fields, including physics, chemistry, and engineering, as it helps in identifying materials, predicting whether an object will float or sink in a fluid, and assessing material properties.

In contrast, weight refers to the gravitational force acting on an object and does not relate to its volume directly. Volume measures how much space an object occupies, while mass indicates the quantity of matter in an object, but neither of these terms denotes the relationship between mass and volume like density does.