BET method

The BET (Brunauer-Emmett-Teller) method is a technique used to measure the surface area of materials, especially porous substances like catalysts or powders. It works by introducing a gas, typically nitrogen, to the material's surface at very low temperatures. The gas molecules stick to the surface, and by measuring how much gas is adsorbed at different pressures, the BET method calculates the total surface area. This information is important because a larger surface area often means higher reactivity or efficiency in various industrial and scientific applications.