  The hadron production in heavy ion collision is treated in the framework of
thermodynamic vision. Thermodynamic system formed during central collision of
Pb-Pb at high energies is considered, through which binary collision is assumed
among the valance quarks. The partition function of the system is calculated;
accordingly the free available energy, the entropy and the chemical potential
are calculated. The concept of string fragmentation and defragmentation are
used to form the newly produced particles. The average multiplicity of the
newly produced particles are calculated and compared with the recent
experimental results.
