(4) What are hot air balloons made up of?
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Answer:
Most hot air balloons are made of nylon
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Explanation:
Most hot air balloons are made of nylon now. Tyvek is sometimes used with experimental balloons, but its flammability makes it unsuitable for most purposes. The fabric near the mouth of the balloon, where the burner is, must endure substantially higher temperatures than the rest of the envelope.
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