Which term describes the quantity of three-dimensional space enclosed by a boundary?

• A. Transparency
• B. Volume
• C. Thermal conductivity
• D. Thermo-electricity

Answer: (B)

Volume describes the quantity of three-dimensional space enclosed by a boundary. It tells you how much inside space a container or object contains, and it’s measured in cubic units (like cubic meters or cubic centimeters; liters are common for liquids). For example, a rectangular prism with sides 2 cm, 3 cm, and 4 cm has a volume of 24 cubic centimeters. For irregular shapes, you can estimate volume by water displacement. The other terms don’t refer to enclosed space: transparency is about light passing through materials, thermal conductivity is about how well heat flows, and thermo-electricity concerns electricity generated from temperature differences.