Because most molecules in water (ρ o ≈ 55.5 mol L -1 ) typically have diffusion constants in the range: 10 -5 -10 -6 cm 2 s -1 , 42 it appears that vortex separation of enantiomers on a centimeter scale should be experimentally achievable, even under conditions where the enantiomers are in competition in a racemic mixture.