You can not make simplistic claims such as this without fully understanding what you claim — you have failed to allow for the mass of the gases per equivalent volumes! (principia-scientific.org)
«We also found equivalent volumes of the hippocampus (a brain structure used for emotion and cognition) across ages. (sciencedaily.com)
In the case of methane, that's 180 units known as v (STP) / v, or standard temperature and pressure equivalent volume of methane per volume of the absorbent material. (sciencemag.org)