Abstract: Gases composition separation is reliable upon nanoporous elements, and thus is still in developing phase. However, it possess various industrial applications which may be include but not limited to gases sanitization, gas detector, fuel cells and even batteries. Numerous materials as of now under investigationtraverses the entire region i.e.organic polymer-centeredfilms to inorganic membranes produced using glasses, metals, carbon, involving additionally fusion sorts, for example, inorganic polymer centered films. Capability of concomitant graphene nanopores for successfully isolating methane through air is determined via density utilitarian hypothesis. Present paper discusses about interaction among selected gaseous molecules and model pores. Chanelling probabilities and dainty as temperature component are appraised by activated composite saddle point energies. The researchers herein represents structural disruptions caused via transient gaseous molecules and further also discusses about materialness and internment of portrayals relient over "molecular size" for judging 2D layers.