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Where does the hot air balloon go?

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