weight/volume of co2 at room temp in canisters

[UKairgunner]

bit of help needed
what is the volume in cm2 of the 12g oF co2 in the small caplets

im sorting out options for next airgun so comparing storage methods

also what would be the weight in grams of 42 cm2 of CO2

can not get my head around the figures so appealing for help
thanks in advance

[UKairgunner]

so after i found some time it seems 1 litre is 1kg...just like water.so 42cm2 would be 42 gram.42 cm2 is the space occupied by 2 caplets in a twin caplet tube so if you bulk charged a twin capsule tube you get 42 gram of co2 compared to 2 times 12..(24).