At 70°F, the following approximation (derived from the Ideal Gas Law) indicates the pressure of a given chamber when filled with a 12g CO2 cartridge:
Pressure (psi) = 5910 / Volume (in^3)
Remember that below 87.8°F, CO2's pressure is limited by its vapor pressure.
Cooling
When released from a 12 gram cartridge, CO2 will rapidly cool everything it flows through. Extra precautions should be taken when using 12 gram cartridges with temperature-sensitive materials such as PVC, which becomes brittle when cold.
Other uses
12 gram CO2 cartridges can be used effectively as projectiles. They are dense, consistently sized, and fit well in 3/4" SCH 40 PVC.
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