★Volume

Volume is a scalar quantity expressing the amount of three-dimensional space enclosed by a closed surface. For example, the space that a substance (solid, liquid, gas, or plasma) or 3D shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre.
The most widely known anecdote about Archimedes tells of how he invented a method for determining the volume of an object with an irregular shape.