In summary, this work suggests that the value of the Planck constant can be determined from the product of electron mass and a diffusive damping term referred to here as "apparent diffusivity" and symbolized by the Greek letter "iota" with a subscript of zero (i.e., 𝜄 0 ) and SI units of meters squared per second. Its formula-definition is determined from a hydrodynamic dual space that conserves three-dimensional space and assumes time-reversal symmetry. The dual-space equation is then combined with experimental values of line spectra to extract an experimentally-determined value for universal diffusivity. Using equation (10), a novel theoretical prediction of the muon magnetic moment anomaly is determined and the resulting value has better accuracy than both the standard model of particle physics and the prediction that results from equation (2) which includes Planck's constant.