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Total gas content is defined as the entire quantity of gas that resides in the pore space at a given temperature and pressure and includes both the gas in the center of the pore (i.e., ¡®free¡¯ gas) as well as the gas adsorbed directly to the pore surface.
Absolute adsorption is defined as the quantity of gas present only in an adsAbsolute adsorptionorbed state.
Excess adsorption is defined as the additional amount of gas adsorbed per unit pore volume compared with the amount of gas in the same volume of a given pore in the absence of pore walls.
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