What is the term for the mass of material per unit volume, represented by the symbol ρ?

The term for the mass of material per unit volume is known as density, represented by the symbol ρ. Density is a fundamental physical property that describes how much mass is contained within a given volume of a substance. It is calculated using the formula: density (ρ) = mass (m) / volume (V).

This property is crucial in various fields of engineering and science, as it affects how materials interact with each other and their environment. For example, in fluid dynamics, density influences buoyancy and flow characteristics. Understanding density is also essential for material selection in design and manufacturing processes, as it can impact strength, durability, and cost-efficiency.

Other options do not accurately define the concept in question. Weight refers to the gravitational force acting on an object and can vary based on location due to changes in gravitational pull. Mass represents the amount of matter in an object, irrespective of its volume or the influence of gravity. Volume quantifies the three-dimensional space occupied by an object. Thus, density is the only term that correctly relates mass to volume in the context provided.