On this day, 242 years ago, November 21, 1783 (October 27, 1783, the lunar calendar), humans made the first hot air balloon trip. November 21, 1783-A pair of brothers in Montgofir, France, flew for 25 minutes in a self-made hot air balloon. This was the first human hot air balloon trip. Roze, a French physicist and pioneer of hot air balloon flight in the 18th century, invented a hot air balloon and named it after him. Hot air balloon expert Cameron improved it 20 years ago. Hot air balloons widely used by global pilots today all use two-layer airbags. The airbag inside is a helium balloon. Air is filled between the two layers of airbags and burners are placed underneath. Throughout the flight, the helium airbag maintained a certain degree of buoyancy. In addition, during the day, sunlight can be used to heat the air in the two-layer airbag to generate buoyancy; at night, the burner can be turned on to heat the air. This saves fuel and is very suitable for long-distance flights. Comments: What a great flight.