
PLEASE don’t try this. Not really sure how you’re envisioning this working, as helium is only solid at a temperature around absolute zero. But in gaseous form, the answer is an amount of helium that would cause death by hypoxia a long time before any floating happened. Estimates of number of balloons required to lift 100 pounds: https://www.uu.edu/dept/physics/scienceguys/2000July.cfm.










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