Abstract
The moment equations of plasma physics are examined. They are arranged in a form that is directly Galilean invariant and is suited for taking advantage of the small charge and current densities that occur in a dense plasma. Further, the results are given in a form that is symmetric in the various species. For a two component plasma the mass momentum, charge, and current densities are the natural variables. When a larger number of species are present the equations become very complicated, particularly when collisional momentum exchange is included. The current does not separate cleanly from other components, and the designation of 'Ohm's Law' becomes arbitrary. The entire set of moment equations can be considered to be the generalized Ohm's Law since they are a coupled set of equations for the sources in Maxwell's equations.
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