  In absence of time-reversal symmetry, viscous electron flow hosts a number of
interesting phenomena, of which we focus here on the Hall viscosity. Taking a
step beyond the hydrodynamic definition of the Hall viscosity, we derive a
generalized relation between Hall viscosity and transverse electric field using
a kinetic equation approach. We explore two different geometries where the Hall
viscosity is accessible to measurement. For hydrodynamic flow of electrons in a
narrow channel, we find that the viscosity may be measured by a local probe of
the transverse electric field near the center of the channel. Ballistic flow,
on the other hand, is dominated by boundary effects. In a Corbino geometry
viscous effects arise not from boundary friction but from the circular flow
pattern of the Hall current. In this geometry we introduce a viscous Hall angle
which remains well defined throughout the crossover from ballistic to
hydrodynamic flow, and captures the bulk viscous response of the fluid.
