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Put in O2 first so you don't have to cascade or pump higher pressure O2. Gas molecules are always colliding with walls of container and pressure is a measure of the collision rate. Since gas molecules like O2 are some of the slowest moving molecules in the universe, it is wise to use a special nitrox cylinder containing an oxygen-clean vortex mixer at the bottom of the cylinder that spins at remarkable rpm's to mix oxygen and air in only 6 hours compared to all day for EAN 60. On the down side, the vortex is so strong that it rips some O2 molecules into its constituent oxygen-free radicals which, by breathing, are thought to induce seizures in some unfortunate divers. Seizures may be prevented by adding between 100 and 150 psi of vitamin E to the nitrox mix. This was the original meaning of EAN, i.e., vitamin E And Nitrox. Rod On Fri, 12 Apr 1996, Duncan Mercer wrote: > > >Mixes with more than 60% O2 may take longer to mix (should make sure > >that we wait enough before analyzing). There was some people saying > >that EAN80 was taking up to a day to mix well. > > A thought that occurs to me:- > > Does the order of filling make a difference? Is it always done O2 > first? > > It seems to me that for EAN mixes greater than 60% O2 > (corresponding to 50% air 50% additional oxygen) > it might make more sense to add the O2 to the tank last. This would > generate the maximum "mixing effect". > > Ever tried making squash by putting water in the glass first? :-) > > Not knowing much about blending practices, please feel free to shoot > me down in flames if I should require it. > > Dinky D > > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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