In addition to pressure, all tanks have a volume rating, which is the volume of air at standard pressure that they contain - most 3000psi aluminum tanks are aluminum 80's, which are 80 cubic foot tanks, but they come in sizes from 2ft.^3 for a pony bottle to 130 ft.^3 steel tanks, and sometimes even larger.
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"CI" on compressed air tanks stands for "capacity index." It refers to the maximum working pressure of the tank, measured in psi (pounds per square inch). It indicates the level of pressure the tank can safely contain without risking damage or failure.
CC stand's for "Cubic Centimeters". There are 16.387 CC's in a CI (cubic inch)
The stamp "SS CI" inside a ring usually indicates the type of metal used, such as stainless steel (SS) or sterling silver (SS) with the maker's initials or hallmark "CI". It helps identify the material and the manufacturer of the ring.
There is no chemical symbol CI. If you meant Cl then it is Chlorine.
They either go to a dive shop or have their own compressors. An average 80 ci tank costs roughly $5usd to fill
At Ci Ci's Pizza.