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It is the difference in compressibility - yo do not get the same amount
of helium per psi as oxygen.

Rob Murray wrote:
> 
> Hi George,
> Thanks for the info on the intermediate stops. That was one of the few
> pieces of the puzzle that still eluded me. I've been diving heliox lately
> and been having great results so far. The one thing that has been a bit of
> a pain is mixing low fo2 heliox mixes though and I was wondering how you
> were dealing with it. I've been using anywhere from 21/79 to 30/70 heliox
> and the 21/79 was the hardest to hit first time. Not sure if it was just
> the heat expansion of the helium or another factor. We are using a digital
> gauge so that should almost eliminate the problem with the O2. For the
> helium we have the electric booster so can get the pressure up to 2700
> easily. I first add the O2 then bring the tanks to the shop and add the
> helium with a 10-12% over fill of helium and let sit.
> Is this pretty much the extent of it or am I overlooking something or just
> need to get the "feel" for filling heliox like I did for nitrox/trimix?
> 
> Thanks again and Happy New Year. Safe diving and smoke some cave in 2000!
> 
> Rob


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