Question

why are hot air balloons more effective than hydrogen balloons?

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Answer 1

Hot air balloons use hot air. They have a burner to heat the air. Hydrogen balloons were too dangerous because hydrogen is highly flammable, even static electricity could cause an explosion. Helium is safer because helium is not flammable.Please mark as brainliest

Answer 2

Answer:

because helium is lighter than air

Explanation:

a helium ballon rises when hydrogen is another gas lighter than air