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Where does the hot air balloon go?

A hot air balloon is a lighter-than-air (Si apre in una nuova finestra) aircraft consisting of a bag, called an envelope, which contains heated air. Suspended beneath is a gondola (Si apre in una nuova finestra) or wicker basket (Si apre in una nuova finestra) (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 (Si apre in una nuova finestra). The heated air inside the envelope makes it buoyant (Si apre in una nuova finestra) since it has a lower density (Si apre in una nuova finestra) than the colder air outside the envelope. As with all aircraft (Si apre in una nuova finestra), hot air balloons cannot fly beyond the atmosphere (Si apre in una nuova finestra). 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 (Si apre in una nuova finestra) fabric and the inlet of the balloon (closest to the burner flame) is made from a fire resistant material such as Nomex (Si apre in una nuova finestra). 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 (Si apre in una nuova finestra) and François Laurent d'Arlandes (Si apre in una nuova finestra) on November 21, 1783, in Paris (Si apre in una nuova finestra), France (Si apre in una nuova finestra),[1] (Si apre in una nuova finestra) in a balloon created by the Montgolfier brothers (Si apre in una nuova finestra).[2] (Si apre in una nuova finestra)The first hot-air balloon flown in the Americas was launched from the Walnut Street Jail (Si apre in una nuova finestra) in Philadelphia on January 9, 1793 by the French aeronaut Jean Pierre Blanchard (Si apre in una nuova finestra).[3] (Si apre in una nuova finestra) Hot air balloons that can be propelled through the air rather than simply drifting with the wind (Si apre in una nuova finestra) are known as thermal airships (Si apre in una nuova finestra).