> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Howard Winter
> Sent: 18 March 2010 17:15
> To: Microcontroller discussion list - Public.
> Subject: Re: [TECH]:: Factors affecting gas flow through a porous
> membrane/Help!
> 
> Russell,
> 
> On Fri, 12 Mar 2010 04:13:32 +1300, Russell McMahon wrote:
> 
> >...
> > The important implication for me is the (utterly obvious now) fact
> > that you CANNOT stop a given gas diffusing by "balancing" it with
> > anything on the other side.
> 
> Indeed, and I've observed this with CO2 dissolved in liquid vs.
present in
> the gas above it (ie a bottle of Coke which isn't full).  You can buy
a
> little pump fitted to a
> lid which you put onto the bottle, and give a number of squeezes,
> increasing the pressure in the bottle by adding air.  It's sold as
> preventing part-empty bottles
> losing their fizz, but the result is as expected from what you say
above -
> it's completely useless!  Note that there is no membrane, just the
> liquid's meniscus, but I
> think the principle at work is the same.
> 
> I wonder if I could bring a case under the Trades Descriptions Act, or
the
> Sale of Goods Act, because the the device doesn't do what it's being
sold
> for?

See, there is a good reason to increase CO2 levels in the air! ;)

Mike

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