What term defines the amount of mass in a known volume of an object?

The term that defines the amount of mass in a known volume of an object is density. Density is a physical property that describes how much mass is contained within a specific volume. It is usually expressed as mass per unit volume, such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³). Understanding density is crucial in various scientific fields, as it affects how substances interact and behave under different conditions.

In contrast, mass refers to the amount of matter in an object, volume is the space that an object occupies, and shape relates to the form or outline of an object. While mass and volume are components used to calculate density, it is the ratio of these two measurements that ultimately defines density itself.