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The bulk viscosity is calculated for hadron matter produced in heavy-ioncollisions, being described in the relaxation time approximation withi n therelativistic mean- field-based model with scaled hadron masses and couplings. We show how different approximations used in the literature affect the result.Nume rical evaluations of the bulk viscosity with three considered modelsdeviate not much from each other confirming earlier results.

Remarks concerning bulk viscosity of hadron matter in relaxation time ansatz