The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________? August 22, 2021February 15, 2019 by admin The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________? A. D ∝ P0.5 B. D ∝ 1/P0.5C. D ∝ 1/P D. D ∝ 1/P1.5