What is the principle of hot air balloon?

A balloon that uses hot air to generate buoyancy.

The principle of hot air balloon flight is that the density of hot air is less than that of cold air, and the same volume of hot air is lighter than that of cold air, resulting in buoyancy. By heating the air in the balloon to make it lighter and generate buoyancy, the balloon can be lifted off under load.

By turning on the interval of the combustion switch, the temperature (gas density) of the balloon is adjusted to control the rise and fall of the hot air balloon; Use the wind direction of different height layers to control and adjust their own direction; A hot air balloon can't change its direction actively, and its flight speed is the same as the wind speed.

A hot air balloon is an aircraft lighter than air, with an atmospheric sphere on the upper part and a hanging basket on the lower part. Air is heated inside the balloon, and the air density is lower than that of cold air outside, which plays a role in buoyancy and displaces the whole body; Hanging baskets can carry passengers and heat sources (mostly open flames).

Modern sports balloons are usually made of nylon fabric and the opening is made of refractory material. Can be used in air sports, photography, tourism and so on. The first manned hot air balloon was made by Montgolfier Brothers, and was launched in Jean-Fran, Paris, France on June1783+065438+1October 2 1. ois Pil？ Trederozil and Fran? It was initiated by Ois Laurent d'Arlandes. The first hot air balloon flying in the United States was launched from the Walnut Prison in Philadelphia by Jean Pierre Blanchard of Air France on June 5438+0793+1October 9. [2]? At present, there are four types: AA, AX, AM and AS.