Adsorption is a process that fluids (adsorbate) interact with surface of solid (adsorbent) on the surface or inside the pore. One of the key when the adsorption is deal with is the adsorption isotherm. The adsorption isotherm is obtained by measuring the uptake (the adsorbed amount) as a function of pressure at a given temperature. Adsorption isotherm can be demonstrated with the increase of pressure from the emptied pore (adsorption) or with the decrease of pressure from the filled pore (desorption). The hysteresis loop between the adsorption and desorption on adsorption on surface and in micropore (