Modified BET theory for actual surfaces: implementation of surface curvature.The Brauner-Emmett-Teller (BET) theory was originally based on adsorbing surfaces of zero curvature.  It is shown that for porous materials with cylindrical pores (15 cases), while the average error in the calculation of the specific surface area using the original BET theory is ca.  For porous materials with spherical pores (20 cases), an average error of 58% (BET theory) is reduced to 15%. 
BET