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A blimp is filled with 5000 m3 of helium at 20°C and 1.05 bar pressure. The volume of the cabin is 30 m3 and the mass of the empty blimp structure (no helium) is 4200 kg. What is the maximum additional mass m􀁶 that can be loaded into the cabin and still permit lift off? The surrounding air is at 1.00 bar pressure and 20°C. The molar mass of air is 28.8 g mol–1.

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