Hot air balloon pilots use propane to heat their balloons. It's inexpensive, very easy to obtain, and works.
air balloons or hot air balloons fly because they fill with a very light type of air. The air is hot air.
Hot air balloons were used for reconnaissance during the civil war.
Hot air balloons can be seen over several major cities during festivals, depending on the festival. For example, hot air balloons will travel over Atlanta and New York City during certain key events.
No. They had observation balloons.
ummm...they didn't?
Hot air balloons were used to spy on the enemy. They were also used to communicate, send supplies, and drop bombs.
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Yes, no matter how much air is filled inside of the balloons.
Hot air is used for hot air balloons.
Helium is a gas used to inflate lighter than air balloons.
hot air balloons and balloons
They were used for reconnaissance of troops in the civil war. They were the first type of "spy" from the air.