HYDRODYNAMIC FORM OF THE WEYL EQUATION

A hydrodynamic form of the wave equation for the neutrino wave functio n is derived. The formulation is similar to that given by Takabayasi f or the nonrelativistic Pauli equation. The hydrodynamic variables comp rise one scalar field - the density - and two vector fields - the velo city and momentum. The reduction in the number of variables to four re quires a quantization condition - the same as in the nonrelativistic c ase - that relates the curl of the momentum field to an axial vector b uilt from the velocity field.