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The lattice QCD data of pressure and the energy density have been used toextract the hadronic radius parameter of the excluded volume hadron resonancegas (EVHRG) model. The equation of state can be described well with theextracted radius parameter $R_h= 0.15$ fm. Specific heat is also calculated inthe EVHRG model. Further, two new universal descriptions of chemical freeze-outparameters have been introduced based on pressure and specific heatrespectively. It is shown that the chemical freeze-out parameters obtained atvarious $\sqrt{s_{NN}}$ in ideal HRG model approximately correspond to $P/T^4=0.88$ and $C_V/T^3= 47$ respectively. These two quantities are important todescribe the thermodynamic properties of the hadronic matter created in heavyion collision experiment. The sensitivity of universal chemical freeze-outlines on repulsive interaction is also studied. It has been observed that thebehaviors of chemical freeze-out lines for $P/T^4$ and $C_V/T^3$ in EVHRG modelremain similar to ideal HRG model for the best fit value of hadronic radii.

Universal descriptions of chemical freeze-out based on pressure and specific heat