Kynch TheoryKynch started from the postulate that u = u(C). As noted above, this was assumed true by Coe and Clevenger for their “free settling”, and we have used it as the defining relationship for the zone settling regime. Using a continuity approach, Kynch showed that:A concentration discontinuity would propagate with a velocity:U = ΔG/ΔCA locus of constant concentration in a concentration gradient will propagate with a velocity:U = dG/dC