Which one of the following would a hydrogen balloon find easiest to lift? (a) 1 kg of water (b) 1 kg of copper (c) 1 kg of loosely packed feathers (d) 500g of copper

Which one of the following would a hydrogen balloon find easiest to lift? (a) 1 kg of water (b) 1 kg of copper (c) 1 kg of loosely packed feathers (d) 500g of copper
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