Introduction

It is well established that Quantum Chromo-Dynamics (QCD) at finite temperature exhibits a typical behavior of a system with a phase transition. At sufficiently high temperatures and/or densities, quarks and gluons are no morelonger confined into hadrons. This indicates that the strongly interacting matter undergoes a phase transition from hadronic state to what has been called the "Quark-Gluon Plasma" (QGP) or Partonic Matter. This new state has been observed and has been identified as being the QCD partonic plasma in Ultra-Relativistic Heavy Ion Collisions (URHIC) experiments at RHIC and LHC [1], and certainly the volume in which the QGP would possibly have been observed is certainly finite.
All hadrons created in the final stage of URHIC are colorless. Therefore, the whole partonic plasma fireball needs to be in a colorless state called colorless PP (CPP). When we insert the colorless condition [2] in the MIT bag model [3], we obtain our colorless- MIT bag model using a mixed phase system evolving in a finite total volume V [4, 5, 6, 7, 8]. As we know, the low temperature phase of QCD is dominated by pions, only. Only a massless pion gas has been considered in the previous work.