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Henry Calendish had this idea because hydrogen has a negative weight, which is lighter that air, which causes objects to float.
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Joesph Michel Montgolfier was able to make the bag rise up and fly for about 10 minutes.
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The two brothers had a duck, a rooster, and a sheep in a basket attached to a big bag filled with hot air that fleew up three kilometers adn stayed there for about eight minutes.
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The first person to ride in a hot air balloon was Jean-Francois Pilatre de Rozier. The first time riding in the balloon, it was ied to the ground for safety.
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They traveled a total of around 16 kilometers at 3000 feet for over 25 minutes. To keep the air hot, they had a fire buring on a grill right below the balloon that they added straw to every now and then.
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Jacques and a man named Noel Roberts flew 27 miles using the hydrogen balloon.
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The balloon exploded after flying for only 30 minutes.
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The first flight in America was piloted by Jean Pierre Blanchard.
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People used hot air balloons to spy behind enemy lines.
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It started off in North America and England with few enthusiasts and soon spread to Australia.
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