Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________? August 22, 2021February 17, 2019 by admin Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________? A. K ∝ D B. K ∝√D C. K ∝ D1.5 D. K ∝ D2