Note: The number of links, \(m\), and their length, \(l^{\prime}\), are evaluated from the mean-square end-to-end distance, \(\lt\!r_{\rm{o}}^{2}\!\gt\), and contour length, \(r_{\rm{max}}\), of the actual chain using the equations in freely jointed chain and contour length, with \[m = \frac{r_{\max}^{2}}{\lt\!r_{\rm{o}}^{2}\!\gt} \quad {\rm{and}} \quad l^{\prime} = \frac{\lt\!r_{\rm{o}}^{2}\!\gt}{r_{\max}}\] For example, for polymethylene at room temperature, one freely jointed link is equivalent to about 10 actual \(\ce{C-C}\) skeletal bonds.