86.9 Empirical rule for diffusion Factors influencing diffusion 1. Temperature and the diffusion coefficient D=De /RT D: The activation energy for diffusion of species under consideration R: The gas constant T: The absolute temperature Do: The pre-exponential term§6.9 Empirical rule for diffusion Factors influencing diffusion 1. Temperature and the diffusion coefficient RT Q o D D e − = D : The activation energy for diffusion of species under consideration. R : The gas constant T : The absolute temperature D0 : The pre-exponential term