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Why are burners used inside hot air balloons?

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Hot air balloons are bouyant bacause hot air is less dense than ambient air. The difference in density results in the balloon rising. The air must be heated. I'm certain that an alternative heat source could be developed given sufficient funds and design resources. read more

The short answer is that it’s not a hot air balloon without some way to heat the air, and a burner is an efficient and lightweight way to do that. It’s worth noting that the burner is not actually *inside* the balloon. It sits in a burner frame that is suspended above the basket and below the envelope (the fabric part that contains the hot air). read more

Hot Air Balloon envelopes can withstand temperatures up to approximately 250°F for long periods of time. Hot air balloon burners use liquid propane tanks (just like your grill) that travel through tubes to the burner to heat the envelope of the balloon. read more

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Hot Air Balloon Physics
www.real-world-physics-problems.com

How do hot-air balloons work?
www.explainthatstuff.com

why do hot air balloons float up?
science.howstuffworks.com