Tripling of the diffusion rate would correspond to a factor 3.
Substances diffuse when they travel passively from one area of high concentration to another area of lower concentrations . During cellular transport in plants, diffusion of chemicals is crucial. The concentration gradient, membrane permeability, temperature and pressure all have an impact on the rate of diffusion . As long as there is a difference in a substance concentration on either side of a barrier, diffusion will occur.
So by tripling the diffusion rate it would change to factor of 3.
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