at the surface of tension. Using the Gibbs adsorption equation, Tolman himself showed that the Tolman length can be expressed in terms of the adsorbed amount at the surface of tension at coexistence where ; the subscript zero to the density denotes the value at two-phase coexistence. It can be shown that the difference between the location of the surface of tension and of the equimolar dividing surface proposed by Gibbs yields the value of the Tolman length: where the denote the locations of the corresponding surfaces making the magnitude of the Tolman length in the order of nanometers. References J.S. Rowlinson and B. Widom, ''Molecular Theory of Capillarity (Clarendon, Oxford, 1982) Physical chemistry Thermodynamics