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> >I have to disagree with your statement that rolling cylinders in to ensure
> >proper mixing prior to analyzing is "hogwash" I have seen the results first
> >hand.  Mild agitation will infact reduce the time needed for complete mixing
> >prior to analyzing.
> >
> >
>     This is the kind of misinformation that I am really getting sick
>     of reading. 

I have heard from more than one honest person that they have seen this effect.

If the mixing theory is "hogwash" what's going on?

Is there residual gas trapped in the valve that is throwing readings off, or 
is it some other effect?

Someone else wrote that the CGA (Compressed Gas Association) recommends 
rolling. Is that correct information? Why would an engineering group recommend 
rolling if it is hogwash? Is the rolling done for some other reason than
mixing? 

Let's not start a flame war, let's just get the correct answer. If the rolling 
procedure is based on misinformation, it seems to be a pretty widespread 
misconception and should be corrected.

Rick

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