Several techniques are used to measure SSA, with the most common being the Brunauer-Emmett-Teller (BET) method. The BET method involves the adsorption of gas molecules onto the surface of the material and calculating the surface area based on the amount of gas adsorbed. Other techniques include mercury intrusion porosimetry and various microscopic methods, such as scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
