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7,100 liters is about one-three-hundredth as big as a Hot Air Balloon
In other words, it's 0.0032 times the size of a Hot Air Balloon, and the size of a Hot Air Balloon is 310 times that amount.
(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 2,200,000 liters. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
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