[TheForge] Argon-CO2 mix question

[Bruce Freeman]

Jerry,
Your thinking of what you can pour into a container in
the room.
In a cylinder the situation is different because the
pressure can go WAY up.  In fact, CO2 in a cylinder is
a liquid, not a gas or solid.  You can get special CO2
cylinders that have a tube all the way to the bottom
and tap off the liquid.  This liquid will flash at
room pressure into gas AND solid.
So, what I'm thinking is that the Argon-CO2 that is
sold for welders is probably a mixture that will exist
unchanged between the liquid and gas phases.  Such a
mixture is called an 'azeotrope'.  However, a quick
search of the web did not locate CO2-argon azeotrope 
information, so this is only speculation.
Bruce
NJ
--- Jerry Smith <jerry_smith at anvilsandinkstudios.com>
wrote:

> Bruce,
> 
> Maybe I missed some in college chemistry 101, but I
> thought CO2 could only be a gas or a solid, maybe I
> am
> wrong. 
> 
> Jerry
> 
> --- Bruce Freeman <freemab222 at yahoo.com> wrote:
> 
> > If the argon and CO2 exist as gases in the
> cylinder,
> > then separation is impossible.
> > 
> > However, CO2 may exist at that temperature and
> > pressure as a liquid, in which case separation is
> > possible.
> > 
> > I would guess that in formulating the Argon-CO2
> > mixture, this possibility was accounted for, and
> > somehow rendered irrelevant.  
> > 
> > However, to be sure, you'd have to talk to a
> > technical
> > man at the gas supplier.  I don't mean the local
> > welding supply store, but someone back at the
> > headquarters of the company - like AirGas, MG,
> etc.
> > -
> > that does the gas blending.
> > 
> > Bruce
> > NJ
> 
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