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So is there anything else you can put in balloons? I for one, miss them.
How does Nitrogen rate for buoyancy ? I understand that the gas sold to inflate balloons is normally diluted the Nitrogen to reduce the cost while maintaining adequate buoyancy. I notice that Argon is cheaper than Helium is it any good for lifting ?
Hold your party in a sealed chamber containing 20% oxygen mixed with something very dense. Argon might just do it but lets go with krypton to make sure.Then a balloon full of ordinary air would float.Of course, the krypton might be a bit expensive and the voices at the karaoke would be a bit off key.
What about filling one's balloon with pure Tritium. With a molecular weight of 6, it would be slightly more dense than Helium (MW 4). However, perhaps it would generate a little energy to make up for the excess weight. And the decay product, 3He is still a lighter than air gas.