Cubic Inches or the Volume. The Bigger the CI the more air its holds.
3000psi is the pressure for the tank regulator in nitrogen and HPA (high pressure air) tanks, and not a measure of capacity. Usually capacities for airtanks for paintball use are in units of cubic inches (ci) for nitrogen and HPA and ounces or grams (oz/g) for carbon dioxide tanks. Another thing to take into consideration is the efficiency of your paintball marker.
compact injection
Catcher's Interference
Ci doesn't stand for anything on the periodic table. However Cl (with a lowercase L) stands for chlorine.
Cubic Inch
Chlorine.
coupe injection
catcher interference
crime investigation
CC stand's for "Cubic Centimeters". There are 16.387 CC's in a CI (cubic inch)
At Ci Ci's Pizza.
CI4 * carbon (IV) iodide * carbon iodide * carbon tetraiodide * tetraiodomethane