The term for the ratio of the mass of an object to its volume is density. Density is a physical property that helps determine how much matter is packed into a given space. It is typically expressed in units like grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). Understanding density is essential in various scientific fields, including physics, engineering, and materials science, as it influences buoyancy, stability, and the behavior of substances in different media.