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In the last mail john 015 said: > > A shaving blade can float practically > forever on water Until it goes rusty!!, this is not a good analogy because here you are trying to mix a solid with a liquid..quite a different kettle of fish. > ideal (pV=nRT) so maybe it takes on a souplike behaviour as far > as mixing goes at some fill pressure. Highly likely, if you compress a gas far enough it will become a liquid, Nitrogen does this rather nicely when no other gases get in the way. A Lot of this discussion has included talk of brownian motion, surely if the gases in question are of a similar molecular weight, and freely miscible, then if you fill your tanks on one day and leave them for about twelve hours then reanalyse, this will be sufficient to allow full mixing by simple diffusion. Obviously the diffusion rates of the gases will be slower under pressure, but they will still mix quite well. All of the gasses we are talking about are fully mixed at 1ATA in the air we breathe..no stratification there!. I don't roll my cylinders, but then the car probably does that quite nicely on route to the dive site! Try this scenario: You're diving on Sunday..Fill you tanks on Saturday..Go to the dive site and analyse them prior to the dive. How does that sound. Stout flippering all round! Ali ******************************************************************************* Dr A.M.Lawrie, Dept. Human Anatomy and Cell Biology, University of Liverpool, Tel: (+44) 151 794 5510 Ashton Street, Fax: (+44) 151 794 5517 Liverpool, L69 3BX. email: aml@li*.ac*.uk* *******************************************************************************
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