%0 Book Section %T Bulk viscosity of a pion gas publisher Amer Inst Physics %D 2011 %U 978-0-7354-0899-9 %@ https://hdl.handle.net/20.500.14352/45422 %X We calculate the bulk viscosity of a pion gas at low energies within the kinetic theory approach and show the importance of dealing properly with the zero modes of this transport coefficient. %~