The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and the balloonist together weigh 168 kg, what would the diameter of a spherical hydrogenfilled balloon have to be in meters if the rig is to get off the ground at 22°C and 758 mm Hg? (Take MMair = 29.0 g/mol.)
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