In the language of hydrodynamics, a condition of time-reversal symmetry implies that the dimensionless Reynolds number 𝑁 Re is tiny and the flow regime is "laminar" (𝑁 Re ≅ 1) or "creeping" (𝑁 Re ≪ 1) rather than turbulent (𝑁 Re ≫ 1). In the context of the Navier-Stokes equations, the time-symmetric condition, combined with the assumption of incompressibility, eliminates the non-linear terms and results in exact, explicit solutions describing hydrodynamic transport (e.g., Stokes law, Hele-Shaw equation, and the Hagen-Poiseuille equation). In this section, dimensional analysis results in a diffusive master equation for hydrodynamic dual space that relates frictional energy dissipation 𝐸 f [kg 1 m 2 s -2 ] of fluids in contact with a geometric interface of arbitrary shape, with a finite volume V [m 3 ] and surface area 𝐴 s [m 2 ]. The dimensionless Poiseuille number is then employed to describe the prototype spherical geometry which is later postulated to correspond to negatively-charged leptons such as the muon and electron.