Brunauer–Emmett–Teller surface area

unit: $\pu{m2 kg-1}$
initialism: BET
https://doi.org/10.1351/goldbook.13997
Specific surface area (\(\pu{m2 kg-1}\)) determined from the adsorption isotherm of a gas with the help of the Brunauer, Emmett, and Teller model using the conventional value for the molecular cross-section.
Notes:
  1. The most common gas used is \(\ce{N2}\) with the conventional molecular cross-section of \(\pu{0.162 nm2}\). With nitrogen, the total area is measured; this area includes the area in pores (that may not be reached by light). In this case, the expression \(\rm{BET}(\ce{N2})\) is used.
  2. The area-related parameters do not characterise the catalyst in photocatalysis as they do in heterogeneous dark catalysis. The properties of a photocatalyst are not directly proportional to their area, in view of the fact that light does not equally reach every part of the surface area or particle.
Source:
PAC, 2011, 83, 931. (Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)) on page 943 [Terms] [Paper]
Citation: 'Brunauer–Emmett–Teller surface area' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.13997 RIS BibTex EndNote
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