  In the present work, particle creation mechanism has been employed to the
Universe as a thermodynamical system. The Universe is considered to be a
spatially flat FRW model and cosmic fluid is chosen as a perfect fluid with a
barotropic equation of state -- $p = (\gamma -1)\rho$. By proper choice of the
particle creation rate, expressions for the entropy and temperature have been
determined at various stages of evolution of the Universe. Finally, using the
deceleration parameter $q$ as a function of the redshift parameter $z$ based on
recent observations, the particle creation rate has been evaluated and its
variation at different epochs have been shown graphically.
