CO2 cartridge


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12 gram CO2 cartridges are used primarily as a portable way to provide pressurized gas to a pneumatic cannon. They cost roughly $0.50 a piece, and are typically connected via an adapter, which can be purchased for about $10 USD. Once empty, they are often used as projectiles - they have a high mass, are quite sturdy, and fit in 3/4" SCH. 40 PVC.


The following is a chart outlining the chamber size (in cubic inches) vs. pressure in (pounds per square inch) using a 12 gram CO2 cartridge:

Chamber Size (ci)Chamber Pressure (PSI)
10420
20210
30140
40105
5084
6070
7060
8053
9047
10042

To calculate the pressure for any non-given value, use this equation, but note that the pressure can't go above 800 PSI (the vapor pressure of CO2).

4200/Chamber Volume In ci=Chamber Pressure in psi -OR- 4200/CV=CP
For example:
You have a chamber volume of 41.3ci.
So it can be said that 4200/41.3=CP
4200/41.3 is equal to 101.6949152542373 For simplicity's sake we will round this to 101.7
This means that CP=101.7 PSI
Your 41.3ci chamber will have a pressure of 101.7 PSI when filled with one 12g CO2 cartridge.