A Calculation of the Viscosity to Entropy Ratio of a Hadronic Gas

We calculate thermodynamic quantities and transport coefficients of a hadronic gas using a Monte Carlo hadronic collision event generator URASiMA. The obtained shear viscosity to entropy density ratio of the hadronic gas is approximately 0.3 – 0.6 in the range $T$ = 100 – 180MeV and is quite insensitive to the baryon number density.