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Where does the hot air balloon go?

A hot air balloon is a lighter-than-air (Öffnet in neuem Fenster) aircraft consisting of a bag, called an envelope, which contains heated air. Suspended beneath is a gondola (Öffnet in neuem Fenster) or wicker basket (Öffnet in neuem Fenster) (in some long-distance or high-altitude balloons, a capsule), which carries passengers and a source of heat, in most cases an open flame caused by burning liquid propane (Öffnet in neuem Fenster). The heated air inside the envelope makes it buoyant (Öffnet in neuem Fenster) since it has a lower density (Öffnet in neuem Fenster) than the colder air outside the envelope. As with all aircraft (Öffnet in neuem Fenster), hot air balloons cannot fly beyond the atmosphere (Öffnet in neuem Fenster). The envelope does not have to be sealed at the bottom, since the air inside the envelope there is at about the same pressure as the surrounding air. In modern sport balloons the envelope is generally made from nylon (Öffnet in neuem Fenster) fabric and the inlet of the balloon (closest to the burner flame) is made from a fire resistant material such as Nomex (Öffnet in neuem Fenster). Modern balloons have been made in many shapes, such as rocket ships and the shapes of various commercial products, though the traditional shape is used for most non-commercial, and many commercial, applications.

The hot air balloon is the first successful human-carrying flight technology. The first untethered manned hot air balloon flight was performed by Jean-François Pilâtre de Rozier (Öffnet in neuem Fenster) and François Laurent d'Arlandes (Öffnet in neuem Fenster) on November 21, 1783, in Paris (Öffnet in neuem Fenster), France (Öffnet in neuem Fenster),[1] (Öffnet in neuem Fenster) in a balloon created by the Montgolfier brothers (Öffnet in neuem Fenster).[2] (Öffnet in neuem Fenster)The first hot-air balloon flown in the Americas was launched from the Walnut Street Jail (Öffnet in neuem Fenster) in Philadelphia on January 9, 1793 by the French aeronaut Jean Pierre Blanchard (Öffnet in neuem Fenster).[3] (Öffnet in neuem Fenster) Hot air balloons that can be propelled through the air rather than simply drifting with the wind (Öffnet in neuem Fenster) are known as thermal airships (Öffnet in neuem Fenster).