The volume of a 3D shape is the amount of space inside it. Volume is measured in cubic units such as cm³ and m³. The volume, or capacity, of liquids is measured in millilitres or litres. The surface ...

If physicists ran candy stores, gumball machines might be filled with pyramids instead of spheres. It seems that tetrahedra, with their four triangular faces, are the most efficient shape for filling ...