Adsorptive properties of PFA-derived carbon adsorbents were studied by measuring high pressure adsorption of light gases. A high pressure volumetric gas adsorption apparatus was designed such that it was sensitive enough to accurately capture adsorption uptake of light gases at room temperature. A list of gases, ranging from He to SF6, provided different kinetic diameters to study entropic effects during process of adsorption. Besides, enthalpic effects arising from differences in chemical structure of gas molecules, such as acidic, basic and polarity were investigated. A correlation between collected adsorption data and the structure of carbon material was developed. Pore structures of PFA-derived carbons were analyzed by nitrogen and CO2 porosimetry methods determining that poresize of carbons were all below 10 Å. That small poresize, in most cases, prevented adsorption of more than 1 layer of adsorbate molecules on the adsorbent surface. By using this fact, the role of mutual interactions between adsorbate-adsorbate molecules relative to the overall force field energy was determined. For heavier gases mutual interaction terms were not negligibl.