The complement: a solution to liquid drop finite size effects in phase   transitions
  The effects of the finite size of a liquid drop undergoing a phase transition are described in terms of the complement, the largest (but still mesoscopic) drop representing the liquid in equilibrium with the vapor. Vapor cluster concentrations, pressure and density from fixed mean density lattice gas (Ising) model calculations are explained in terms of the complement. Accounting for this finite size effect is key to determining the infinite nuclear matter phase diagram from experimental data. 
L. G. Moretto, K. A. Bugaev, J. B. Elliott, R. Ghetti, J. Helgesson   and L. Phair