BET

BET, or the Brunn–Emmet–Teller theory, is a method used to analyze the surface area of materials, particularly porous substances like activated carbon. It relies on measuring how nitrogen gas adsorbs onto the surface of a solid at various pressures. By understanding how much gas the material can hold, scientists can estimate the total surface area available for reactions or interactions. This is important in fields like chemistry, materials science, and environmental engineering, as it helps determine the effectiveness of catalysts, adsorbents, and other substances in various applications.