The paucity of material space sampled. We only considered the eight nanoporous materials in Fig. owing to a paucity of experimentally measured xenon adsorption isotherms for input to our model. Fig. displays the diversity of the material parameters {M, K, ρ ads } among this set of materials. There are thousands of additional exiting MOFs that could, possibly, provide a lower tankage fraction than the bulk storage system. Thin-wall approximation for the pressure vessel. We invoked the thin-wall approximation to determine the thickness of the walls of the pressure vessel via eqn. 2. Fig. shows that, indeed, r t, making this approximation reasonable.