| http://www.w3.org/ns/prov#value | - ir is ~ 1.2kg/m^3, so to produce 100 kg of lift (average weight of an adult male American: 90kg) you would need a balloon with a volume of 100/1.2 = 83.333.. m^3.If your balloon is a sphere, the diameter should be 2 * (83.333 / (4*pi/3))^(1/3) = 5.42 meters.
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