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A recreational (open) hot air balloon (i.e., Pinside is approximately Poutside) has a volume of 2283 m3 when fully inflated. The total weight of the balloon, basket, ballast and pilot is 1852.2 N (417 lbs). By how much must the density of the air in the balloon be smaller than that of the surrounding atmosphere in order to keep the balloon floating level near the ground?
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