Originally Posted by DustinHickey
Hehe, yea isnt N20 what they use in the dentists office? Nitrogen is the correct answer. And it is a mixture of 25% Co2 and 75% Nitrogen. The main reason is so you can dispense beer at a high pressure through the restrictor plate in the stout tap without overcarbonating the beer in the keg.
Nitrous Oxide or N2O is what they use at the dentist, I would know, I'm a dental student but I think he is referring to N2. Simple mistake!