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They could also fill it with Sulfur Hexafluoride to make it even heavier. Otherwise the balloon would bounce quite a bit. Cute cartoon though.
Where could one get a balloonful of this chemical?
I don’t know, I think it’s used for some industrial processes? So probably wherever you would get small batch industrial chemicals. I know Codys Lab got a bunch, but it seems like he can get his hands on anything.
I am more of a Radon gas enjoyer myself.