BET Theory

The BET (Brunauer–Emmett–Teller) Theory explains how gas molecules adsorb onto a material’s surface, allowing scientists to measure surface area. It assumes that multiple layers of gas molecules can accumulate, with the first layer directly bonding to the surface and subsequent layers stacking onto each other. By analyzing the amount of gas needed to form these layers at different pressures, the theory helps determine how much surface area is available. This is especially useful in fields like catalysis, materials science, and environmental engineering, where surface properties significantly influence performance.