From the perspective of the fluid mechanician, the Madelung formulation (Equation 4) has twoattractive features (Spiegel 1980). First, Planck’s constant h appears only once, as the coefficient on the quantum potential. Second, the system corresponds to that describing the evolution of a shallow, inviscid fluid layer if one associates ρq with the fluid depth and vq with the depth-averaged fluid velocity. When Q is linearized about a state of uniform ρq , it assumes the form of the curvature pressure in shallow-water hydrodynamics (Buhler 2010). One thus sees the relation between ¨ h ¯ in quantum statistics and surface tension σ in shallow-water hydrodynamics.
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