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The helium-filled balloon floats slowly at a low altitude. His the maximum payload, ie crew and...

The helium-filled balloon floats slowly at a low altitude. His the maximum payload, ie crew and load loads, is 1,280 kg. How much this payload could increase if did hydrogen be used instead of helium to fill the balloon? The volume of helium in the balloon is 5 000m3. The density of helium is 0.16 kg · m − 3, the density of hydrogen 0.081 kg · m − 3. (Why is much more expensive helium still used?)

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