Stiffness to Weight Ratio (Specific Stiffness)

The stiffness-to-weigth ratio is a measure of a material's mass efficiency in being able to provide resistance to elastic deformation. In the axial mode, it is calculated as tensile modulus divided by density. In the bending mode, it is calculated as the cube root of tensile modulus divided by density. This corresponds to a scenario where section height is the free variable for an otherwise specified beam. In both cases, the derived units have little physical significance, and "points" are used instead.