Brunauer-Emmett-Teller theory

The Brunauer-Emmett-Teller (BET) theory explains how gases, like nitrogen, adsorb onto solid surfaces to measure surface area. It extends earlier ideas by considering multiple layers of gas molecules stacking on the surface, not just a single layer. This layered adsorption occurs at different pressures, allowing scientists to determine the total surface area by analyzing gas coverage. BET is widely used for characterizing porous materials such as catalysts and powders, providing insight into their surface properties critical for various industrial applications.