Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________? August 22, 2021February 14, 2019 by admin Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________? A. K ∝DB. K ∝√D C. K ∝D1.5 D. K ∝D2