Which term describes the space inside a three-dimensional object?

• A. Mass
• B. Volume
• C. Surface area
• D. Density

Answer: (B)

Volume describes the space inside a three-dimensional object. It measures how much interior capacity the shape has, usually in cubic units like cubic centimeters or cubic meters. This is distinct from mass, which is how much matter the object contains; density, which relates mass to volume; and surface area, which is the total area of the object's outer surface. So volume is the term that specifically quantifies the interior space. For a concrete example, a box that is 3 by 4 by 2 has a volume of 24 cubic units, representing the space inside, while its surface area would consider the exterior faces, and mass or density would depend on the material.