Specific surface area

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BET method

The Brunauer–Emmett–Teller (BET) method is the standard method to measure the specific surface area of solid materials. The BET or Langmuir surface area of a material is determined from the measurement of the physical adsorption of N2-gas at different partial pressures (ISO 9277). 

Figure. Example of a 5-point BET measurement of a sample.