  We investigate the time evolution of a quark antiquark plasma by solving
numerically the relativistic transport equations derived on the Hartree level
from the Nambu-Jona-Lasinio model. We find that the phase transition in the
expanding quark antiquark plasma is different as compared to that in a static
plasma. The expansion competes with the transition and finally quark droplets
will be formed which subsequently hadronizes. These findings raise the question
whether static thermal models can make at all any prediction about signals of
that transition .
