Due to its high degree of micro-porosity, just one gram of activated carbon has a surface area in excess of 500m2, as determined by adsorption isotherms of carbon dioxide gas at room or 0.0°C temperature. The activated carbon is extensively used in the refining and bleaching of vegetable oils and chemicals solutions, water purification, recovery of solvents and other vapours, recovery of gold, in gas masks for protection against toxic gases, in filters for providing adequate protections against war gases/nuclear fall outs, etc.