Yann A.

Since the average kinetic energy of different types of molecules (different masses) which are at thermal equilibrium is the same, then their average velocities are different. Their average diffusion rate is expected to depend upon that average velocity, which gives a relative diffusion rate. Therefore using Grahams law, the rate of diffusion of He into O2/N2 (or O2 into He/N2) is faster than the diffusion of O2 into N2.

Brent.
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Thanks Brent for your explanation,

I had asked the question on another forum some months back but without any reply. Now I get the begining of one. How fast is O2 going to mix in the inhale lung? As from what I remember from my chemistry classes it should be quasi instant... Now at depth it could be different due to different gas density, maybe.
I dive a Meg and would be interested to see some numbers. English isn’t my mother tongue so something like: I press my manual O2 injector for “x” seconds, I get that much O2 in my CL if I inhale at the same time I breathe “y%” of O2.
I’m just thinking out loud here but to me numbers talk more than words sometimes.
It used to be a time where people used to tumble their nitrox tanks after blending….

Yann.