How does a hot air balloon fly ?

The density of air becomes smaller when heated, and hot air balloons use the density of heated air to be lower than the density of air outside the balloon to produce buoyancy flight. The temperature of the air in the airbag is adjusted through the built-in on-board heater, so as to control the lifting and lowering of the balloon.

The basic principle of hot air balloon is thermal expansion and cold contraction.

When the air expands when heated, the specific gravity becomes lighter and rises upwards. When the hot air balloon rises, the air in the balloon is heated, and the air is discharged to make it lighter, and the gravity is less than the buoyancy to make the balloon load lift; When the hot air balloon descends, it stops heating up, and cold air enters the balloon again, and the gravity of the balloon increases, and it descends when the gravity is greater than the buoyancy.

A hot air balloon is a flight that uses heated air or certain gases such as hydrogen or helium to fly with a density lower than the air outside the balloon. The hot air balloon mainly adjusts the temperature of the air in the airbag through its own on-board heater, so as to achieve the purpose of controlling the balloon lifting.

Safety Matters

1. Try to wear cotton clothing and sports shoes, not skirts, high heels, sandals, etc.; To prevent burns, be sure to wear long coats and trousers and a cotton hat.

2. When the hot air balloon is ignited and lifts off, it will spew out flames up to 3-5 meters in an instant, and at the same time, it will make a loud noise similar to ** sound. Therefore, the experiencer should be fully psychologically prepared when lighting the fire and grasp the hanging basket.

3. The best time to fly in a hot air balloon is within two hours after sunrise or two hours before sunset, because the airflow is most stable during this time. It is not suitable to fly hot air balloons during the windy season.

4. The hanging basket of the hot air balloon is made of rattan and is quadrangular in shape. The hanging basket is about meters long, wide and high. In the gondola, pilots, flight assistants, and experiencers must stand, and 4 bottles of gas and related equipment must be carried, so it will be very narrow.

In order not to affect the pilot's operation, it is recommended that the experiencer stand as far aside as possible and do not touch the relevant equipment in the gondola.

1. The principle of hot air balloon is thermal expansion and cold contraction. The hot air balloon burner will burn the heated air from the port of the lower part of the airbag into the airbag, when the air is heated and expanded, it has a lower density with the outside cold air, and the specific gravity becomes lighter and rises upward, so that the balloon drags the gondola into the air together.

2. A hot air balloon is a lighter than air, with the upper half being a large balloon and the lower half being a gondola.

<> the air inside the balloon is heated, the density of the tung nucleus becomes smaller, and the mass is lighter than the same volume of cold air outside the balloon, so the balloon generates buoyancy and lifts into the air (like ice cubes floating in water). In the case of aircraft, scientists call this buoyancy force lift. Just like water and ice, the density of water becomes cold and old.

If you press the ice to the bottom of the water, it will always float up because the ice is less dense than the water.

<> the air inside the balloon becomes less dense and less massive than the same volume of cold air outside the balloon, the balloon becomes buoyant and lifts off (like ice cubes floating in water). In the case of the Hang's air controller, scientists call this buoyancy the lift. Just like water and ice, the density of water becomes less when it freezes.

Press the old block of ice into the bottom of the water, and it will float up because the ice is less dense than water.