Method Will a 20 cubic foot cylinder of pure nitrogen work or should I get a bigger cylinder? Is it better to use N2?

[Wanted Opioid]

I still haven't bought the cylinder but the hood is ready. I'm not sure if I should use a 20 cubic foot cylinder of pure nitrogen or N2. I read somewhere that 20 cubic foot might not be enough and that I should use a 40 cubic foot cylinder instead. I don't have a car so I would like to know what size of cylinder is easy to transport with public transportation and also can get the job done.

 

[CharizardEX]

Hopefully you get an answer for this i'm wondering as well

 

[Dying Knight]

N2 is nitrogen, so I don't quite understand the "or" part. 20 cubic foot corresponds to 566 litres, this is a rather huge volume for a cylinder, unless the amount of uncompressed gas is meant.