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In this paper we proceed with investigation of connections between Fokker -Planck equation and continuum mechanics. In spectral decomposition of Fokker -Planck equation solution we preserve only terms with the smallest degree ofdamping. We find, that macroscopic parameters of Fokker-Planck flows, obtainedin this way, have following properties: velocities field possess potential, itspotential is proportional to density logarithm and satisfy diffusion equation.We proved, that such a pair of density and velocities field satisfy the set ofclassic hydrodynamics equations for isothermal compressible fluid with frictionmass force, proportional to velocity. We proved also, that the potentialvelocities field alone, with potential, which satisfy diffusion equation,satisfy Burgers equation without mass forces.

Spectral decomposition approach to macroscopic parameters of Fokker-Planck flows: Part 1