Abstract
A thermodynamical description of a single hadron with SU(3) colour singlet restriction as an essential ingredient of the quark-gluon system is given within the MIT bag. Instead of the usual diverging behaviour of the bag radius, we find two bag radii appearing at a transition temperature T s in the large volume limit, and at a critical temperature T c > T s, both the radii merge to a critical value, beyond which there is no bag solution resulting in a first order phase transition to a free quark-gluon plasma. Thus, the SU(3) colour singletness leads to a finite volume correction to the thermodynamic quantities which in turn causes a superheated metastable hadron to appear between T s and T c.
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