  The nonzero bulk viscosity signals breaking of the scale invariance. We
demonstrate that a disorder in two-dimensional noninteracting electron gas in a
perpendicular magnetic field results in the nonzero disorder-averaged bulk
viscosity. We derive analytic expression for the bulk viscosity within the
self-consistent Born approximation. This residual bulk viscosity provides the
lower bound for the bulk viscosity of 2D interacting electrons at low enough
temperatures.
