![]() The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in2 abbreviation: psi) is a unit of pressure or stress based on avoirdupois units. While this gives you more shots per fill, it also significantly affects the size, weight, and price (more on that below). As the CI value of a CO2 tank increases, its capacity increases. A tank’s volume indicates the maximum quantity of compressed liquid CO2 which it can accommodate. Thus, CI is the unit that measures the physical volume of CO2 tanks. ![]() ![]() It is the volume of a cube with each of its three dimensions (length, width, and depth) being one inch long. The cubic inch (symbol in3) is a unit of measurement for volume in the Imperial Units and the United States customary units systems.
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