Gas with exit mask

[baznasty]

I purchased a helium tank from a party store in Canada. It says 100% helium on the tank. Will this be legit?

 

[Incorrigible77777]

If it's helium, then beware that even they say 100%, it might actually be 80% He + 20% O2. Many party stores do that.

 

[Greenberg]

I am almost convinced that the helium will be doped with 20% air. May I suggest that you consider nitrogen or argon. Both will serve your purpose.