Lagrangian Hydrodynamics, Entropy and Dissipation

1. Introduction In this Chapter we deal with a formalism that is both fundamental and an apparently "niche product": I myself confess to have taken the chance of Editors' kind invitation to go deeper into this subject. The subject I am speaking about is the Lagrangian Formulation (LF) of Fluid Dynamics, in particular its theoretical, brutally analytical application to the case of fluids with dissipation. ... ...