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Ok, I was wandering and wondering around a 'party shop' earlier with helium filled balloons everywhere, bumping into my face... nice...
Whilst daydreaming about diving I wondered....
These balloons are filled with 100% helium (I'm assuming??)
So... How much He in a mix would you get away with and the balloon still be positively buoyant in air? Could you get away with some 18/45 or would you need something stronger?
Whilst daydreaming about diving I wondered....
These balloons are filled with 100% helium (I'm assuming??)
So... How much He in a mix would you get away with and the balloon still be positively buoyant in air? Could you get away with some 18/45 or would you need something stronger?