Which of the following concepts represents the mass per unit volume of an object?

Density is the concept that represents the mass per unit volume of an object. It is mathematically defined as the mass of an object divided by its volume and is commonly expressed in units such as kilograms per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³). Understanding density is critical in various applications, such as material science, engineering, and fluid dynamics, as it helps determine whether an object will float or sink in a fluid, its structural properties, and how it interacts with other materials.

Mass refers to the quantity of matter in an object, while weight is the force exerted by gravity on that mass. Volume describes the amount of space an object occupies. While these concepts are related, only density specifically quantifies how much mass is contained in a given volume, making it essential for analysis in power engineering and related fields.