energy, while at LHC energies our calculations could not explain the experimental data. This points to further investigation(s) to understand the possible reason(s) for the deviation of LHC data from the universal freeze-out criteria.

Summary and Conclusion
======================

In summary, we have performed the calculation of global observables like transverse energy of hadrons, charged particle multiplicity and their ratios at midrapidity using our statistical-thermal model. We study the centrality dependence of various hadron ratios using our model and extract T and $\mu_{B}$ at RHIC and LHC energies. We use the same value of T and $\mu_{B}$ to study the centrality dependence of the ratio $E_{T}/N_{ch}$ at those energies. Then we calculate the transverse mass spectra of $\pi^-$ at various $\sqrt{s_{NN}}$, except at $\sqrt{s_{NN}}$ = 2.7 GeV where the transverse mass spectra of $\pi^+$ is calculated by using EVSHGM. We get the average radial flow velocity at various energies by comparing our calculations with the experimental data. Once, we get the radial flow velocity we study the transverse energy per unit rapidity. We also calculate the Bjorken energy density using our model at various $\sqrt{s_{NN}}$. Finally, we calculate the ratio $E_{T}/N_{ch}$ at various energies using our excluded-volume SHGM with and without 