Examples here, one can sort by breaking length: https://en.wikipedia.org/wiki/Specific_strength

(2 GPa) / (1400 kg/m^3 x 10 m/s^2) = (2e9 N/m^2)/(1.4e4 N/m^3) = (2e5/1.4) m = 140 000 m = 140 km

P = F/A, F = M x g, M = A x L x rho

L = M/(A x rho) = (F/g)/(A x rho) = (F/A)/(g x rho) = P / (g x rho)