The leptodermous approximation is applied to nuclear systems for T > 0. The introduction of surface corrections leads to anomalous caloric curves and to negative heat capacities in the liquid-gas coexistence regions. Clusterization in the Vapor is described by associating surface energy to clusters according to Fisher's formula. The three-dimensional Ising model obeys rigorously Fisher's scaling up to the critical point. Multifragmentation data from several experiments including the ISiS and EOS Collaboration provide strong evidence for liquid-vapor coexistence. The phase diagram is obtained for the finite system and a extrapolation is made to infinite nuclear matter.
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