2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191435The relativistic hydrodynamic approach is used to describe production of strangeness and/or heavy quarks in ultrarelativistic heavy ion reactions. Production processes are important ingredients of dissipative effects in the hadronic liquid. Beyond viscosity also chemo- and thermo-diffusion processes are considered. This also allows to specify chemical and thermal freeze-out conditions.v.2 with minor editorial corrections, 7 pages, talk given on the SQM2007 conference, Levoca, June 24-29, 2007. To appear in the proceceeding: Journal of Physics GHigh Energy Physics - Phenomenologytext