The geometric buckling of a bare cylinder of radius \(R\) and height \(H\) is given by \(B_{\mathrm{g}}^{2}=\) \((2.4 / R)^{2}+(\pi / H)^{2}\) using one group approximations. Show that the minimum volume of criticality is \(148 / B_{\mathrm{g}}^{3}\).