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I'd think that the decreased diffusivity (much shorter mean-free-path for the molecules) was the determining factor. The viscosity of air increases by only 30% as you go from 1 bar (~atmospheric pressure) to 200 bar (2900 psi). At 300 bar it's still only 50% higher than at atmospheric pressure.at the high pressures in a scuba tank the mixing rate is so slow because of the short mean-free-path (they don't travel very far before bouncing off another molecule) and viscosity effects
Online - Calculation - Air