The amount of iodine adsorbed per gram of activated carbon at an equilibrium concentration is defined by the Iodine number. Iodine Number is accepted as the most fundamental parameter used to characterize activated

carbon performance. It gives the measure of activity level (higher number indicates a higher degree of activation).

The iodine value (or iodine adsorption value or iodine number or iodine index) in chemistry is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount of unsaturation in fatty acids. This unsaturation is in the form of double bonds, which react with iodine compounds. The higher the iodine number, the more C=C bonds are present in the fat.[1] It can be seen from the table that coconut oil is very saturated, which means it is good for making soap. On the other hand, linseed oil is highly unsaturated, which makes it a drying oil, well suited for making oil paints.

Dear Vikas Chaudhari , the iodine number indicates the porosity of the activated carbon and it is defined as the milligrams of iodine adsorbed per gram of carbon. Iodine number represents the surface area contributed by the pores larger than 1 nm. Iodine number is commonly used in the industry, as a rough estimate of the surface area of the activated carbon.