Surface area and porosity are physical properties that impact the quality and character of solid phase materials. Materials with identical physical dimensions may exhibit entirely different performance profiles based on variations in the physical surface area of the two materials. Surface area measurement if an important analysis used in many industries, including catalysts, zeolites, MOFs, batteries, absorbents, artificial bone, pharmaceuticals, metal powders for additive manufacturing along with a wide variety of other applications and industries. BET analysis provides precise specific surface area evaluation of materials by nitrogen adsorption measured as a function of relative pressure. The surface area is determined by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface of the material. The technique encompasses external area and pore area evaluations to determine the total specific surface area. BET is used to determine a range of disperse, solid microporous to mesoporous materials. BJH analysis can also be utilized to define pore area and specific pore volumes through adsorption and desorption techniques. Using BJH analysis you can conclude pore size distribution independent of external area due to particle size of the sample.