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We use a simplified model which is based on the same physics as inherent in most statistical models for nuclear multifragmentation. The simplified model allows exact calculations for thermodynamic properties of systems of large number of particles. This enables us to study a phase transition in the model.A first order phase transition can be tracked down. There are significant differences between this phase transition and some other well-known cases.25.70-z, 64.60.My Typeset using REVT E X

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The emission of dileptons from a matter distribution undergoing longitudinal hydrodynamic expansion as migh.t be produced in ultrarelativistic nuclear collisions is computed. Contributions come from quark-gluon plasma, from pion gas and from a mixed phase while the matter undergoes a first order confinement phase transition. This yield is compared with that