  We briefly report a calculation of the viscosity of a pion gas at finite
temperature and chemical potential using three different models for the
pion-pion interaction. The results for the Inverse Amplitude Method
interpolation yield a viscosity of order (m_pi^3) up to temperatures of order
m_pi. The calculation is performed within the kinetic theory of gases, by
approximately solving the Uehling-Uhlenbeck equation with relativistic
kinematics.
