Question

The most influencing factor of diffusivity of molecules is _______________

(a) Lattice structure

(b) Temperature

(c) Presence of defects

(d) Diffusing species

I had been asked this question during an online exam.

I would like to ask this question from Role of Diffusion in Bioprocessing topic in portion Mass Transfer of Bioprocess Engineering

Answer 1

(b) Temperature

The most influencing factor of diffusivity is temperature. As temperature increases, the kinetic energy of the molecules increases, leading to faster movement and hence higher diffusivity. While other factors such as lattice structure, presence of defects, and diffusing species can also affect diffusivity, temperature generally has the most significant impact.