### Re: what is the average pressure in a 12 oz. soda can?

Date: Thu Feb 3 11:54:46 2000
Posted By: Kieran Kelly, Consultant, The Boston Consulting Group
Area of science: Engineering
ID: 948833868.Eg
Message:
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It is difficult to give you an exact answer because the pressure depends on
a couple of different factors - the most important of which are the
temperature of the soda and the amount of carbon dioxide that was put into
the beverage in the first place.

To give you a quick example, let's say that the soda was carbonated to 3.0
volumes of CO2 and it has been sitting in your refrigerator so it's around
40 degrees F.  The pressure inside the can will be roughly 17 psig (pounds
per square inch, gauge) above atmospheric pressure.  If you let the can
warm up on the counter so its temperature increases to 70 F or so, the
pressure inside the can will have increased to about 36 psig.

researching the Ideal Gas Law in almost any general chemistry reference.  I
haven't actually done the calculation, but the carbonation is probably
behaving according to PV=nRT.  Try the numbers I just gave you and see if
it works out.  ;)

Kieran

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