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Consider a model of particles (nucleons) which has a two-body interactionwhich leads to bound composites with saturation properties. These propertiesare : all composites have the same density and the ground state energies ofcomposites with k nucleons are given by -kW+\sigma k^{2/3} where W and \sigmaare positive constants. W represents a volume term and \sigma a surface tensionterm. These values are taken from nuclear physics. We show that in the large Nlimit where N is the number of particles such an assembly in a large enclosureat finite temperature shows properties of liquid-gas phase transition. We donot use the two-body interaction but the gross properties of the compositesonly. We show that (a) the p-\rho isotherms show a region where pressure doesnot change as $\rho$ changes just as in Maxwell construction of a Van der Waalsgas, (b) in this region the chemical potential does not change and (c) themodel obeys the celebrated Clausius-Clapeyron relations. A scaling law for theyields of composites emerges. For a finite number of particles N (upto somethousands) the problem can be easily solved on a computer. This allows us tostudy finite particle number effects which modify phase transition effects. Themodel is calculationally simple. Monte-Carlo simulations are not needed.Comment: RevTex file, 21 pages, 5 figure

Model for phase transition based on statistical disassembly of nuclei at intermediate energies