# continuity for charge and mass

01 Mar 2023Whatâ€™s the reason why the continuity equation of electrodynamics is linear and the continuity equation of fluid mechanics is nonlinear, despite having an (almost) identical structure?

Whatâ€™s the reason why the continuity equation of electrodynamics is linear and the continuity equation of fluid mechanics is nonlinear, despite having an (almost) identical structure?