Why can hot air balloons be lifted into the sky?

When the air inside the balloon is heated, it becomes less dense and less massive than the same volume of cold air outside the balloon, so the balloon buoyants and lifts into the air (like ice cubes floating in water). For aircraft, we call this buoyancy lift.

Generally, the flight and lifting of the hot air balloon are related to the temperature in the sphere, the higher the temperature, the greater the buoyancy of the balloon, the balloon will rise rapidly, if the temperature inside the balloon slowly drops, the hot air balloon will slowly fall, the pilot controls the inside of the gondola, the switch of the burner is in their control, and the temperature inside the airbag is adjusted at any time, so that the hot air balloon can fly better and descend.

In addition, there will be differences in wind speed and direction between high-altitude and low-altitude wind speeds, so it is important to understand this knowledge, and if you keep flying in one wind layer, you will be able to fly to a certain target quickly.

Hot air balloons are lifted off with the help of air buoyancy. Hot air balloon is the use of heated air to produce buoyancy flight, after heating, the volume of air inside the hot air balloon expands, and the density is lower than that of the air outside, thus generating buoyancy to make the hot air balloon rise. In addition, using less dense hydrogen or helium to fill the balloon can also gain lift and float or fly in the air.

How can a hot air balloon be lifted into the air??。 It's a stupid question ...

Hot air balloonHot air balloon is because the flame underneath the balloon causes the air to convection between the air and the air inside the balloon, causing the hot air balloon to rise.

Because it contains hydrogen, hydrogen can be lifted off with a small density.

Hot air balloonsThe principle is airThermal 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.

When the air expands when heated, the specific gravity becomes lighter. Because of the unit volume.

The mass of hot air is smaller, hot air is lighter than cold air, and the hot air will rise above the cold air, making it lighter and generating buoyancy heat, which can make the balloon load lift into the air. After the hot air balloon lifts off, the combustion switch is used to adjust the ascent and descent altitudes. When a hot air balloon is going up, it needs to constantly heat the air; When the hot air balloon is about to be lowered, you need to wait for the air to cool down.

The only flying power of a hot air balloon is wind. For a hot air balloon flying around the world, it is necessary to choose a high-altitude air flow with the right speed and direction and move it accordingly in order to complete the flight efficiently. The hot air balloon needs to use the wind direction of different altitude layers to control and adjust its forward direction, and its flight speed is the same as the wind speed, so the hot air balloon cannot actively change direction.

Can hot air from a hot air balloon escape through an opening in the bottom of an airbag?

The hot air of the hot air balloon does not escape from the openings at the bottom of the airbag because the buoyancy causes it to rise. The balloon will continue to rise, with certain height restrictions, as the air eventually becomes so thin that the buoyancy is too weak to lift the balloon. Buoyancy is equal to the weight of the air expelled, so large airbags generally have a higher ascent height limit than small airbags.

What is the power of a hot air balloon?

The power of the hot air balloon is the burner, and its direction of movement must be to follow the wind. The wind direction is different at different heights, at different times, and at different locations, so if you want to adjust the direction, you need to find different wind layers. The rise and fall of a hot air balloon is related to the air temperature inside the balloon, and when the air temperature inside the ball is high, the gravity of the balloon decreases, and when it is less than the buoyancy force, the balloon rises.

The air temperature inside the sphere drops, and the buoyancy generated by the sphere is less than the weight and load of the sphere itself, and the balloon begins to fall.

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. 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.

In order to prevent accidents from endangering your life, as a passenger, you should be fully prepared when you get on the ball. Once the danger occurs, you should follow the steps to deal with it calmly:

1.Observe the gondola: find the location of the fire extinguisher, the location of the fuel cylinder valve, and also the location of the exhaust cable.

2.Obey the pilot's command: In the event of a fire, follow the pilot's command, and if the pilot loses capacity, close the fuel cylinder valve first.

3.Extinguishing the fire with a fire extinguisher: extinguishing the fire with a fire extinguisher; If a hot air balloon rises because someone jumps out of the gondola, you can pull the exhaust rope to open the canopy and stop the ascent.

Related Notes:

The fuel commonly used in hot air balloons is propane or liquefied gas, and the cylinders are fixed in the gondola. A hot air balloon can carry 20 kilograms of liquid fuel. When the fire is lit, the flame is 2-3 meters high and makes a loud noise.

Flying a hot air balloon isn't really "driven", it's going with the wind. However, since the wind has different directions and speeds at different altitudes, the pilot can choose the appropriate altitude according to the direction required for the flight.

The speed of the hot air balloon is determined by the speed of the wind, because the hot air balloon itself does not have a power system, and the flight speed depends entirely on the wind speed. The maximum descent speed of the hot air balloon is 6 m s, and the maximum ascent speed is 5 m s.

Best flight time.

The best time of day is when the sun is just rising or an hour or two before the sun goes down to make a hot air balloon flight, as the wind is usually calm and the air flow is steady.

Duration of the flight.

A hot air balloon usually carries enough LPG or propane to fly for two hours, but some factors also affect the duration of the flight, such as air temperature, wind speed, gondola weight (including passengers) and the exact time of day to fly.

Hot air balloons are lifted off using the principle of buoyancy.

A hot air balloon is a lighter-than-air aircraft with a large balloon on the top half and a gondola on the bottom. The inside of the balloon heats the air, so that it has a lower density than the cold air outside, and acts as a buoyancy force to displace the whole body; The gondola can carry passengers and heat sources (mostly open flames).

Modern sports balloons are usually made of nylon fabric with refractory materials at the openings. A balloon that uses hot air as a floating gas. At the bottom of the airbag there is a large opening for cold air heating and a hanging basket.

The density of air decreases after heating, and the density is about 1 when the temperature reaches 100, which is 1 of air, so the liftoff is not high.

Modern hot air balloons are equipped with simple flight instruments, fuel canisters, and fiber-spraying lamps in the gondola. Lifting from the ground, the sock lights a blowtorch to heat the air and inflate it through the opening at the bottom of the airbag.

After lift-off, control the amount of fuel injected by the blowtorch and manipulate the ascent or descent of the balloon. Hot air balloons were the first to appear, and now flying in a hot air balloon has become a popular aviation sport. In addition, hot air balloons are also commonly used for aerial photography and air tourism.

The whole hot air balloon is subjected to the gravity of the internal gas, the gravity of the ball skin, the buoyancy of the air. The temperature of the gas inside the hot air balloon is high, the density is smaller than the outside air, the density of the gas inside is small, so the gravity is small, and the sum of the gravity of the gas inside and the gravity of the spherical skin is less than the air buoyancy, and it will rise.

Because of thermal expansion and contraction, the air density inside the hot air balloon is lower than that of the outside air, so it has buoyancy to counteract its gravity, so it rises. How to use a hot air balloon will also inspire you. One last nag:

Don't forget to watch the Olympics, long live China! China will win! o(∩_o...

The principle of thermal expansion and cold contraction is adopted. Because heating will make the molecules move violently, which will also increase the molecular gap, correspondingly, the volume of this part of the air will become larger, and the mass of this part of the air will not increase, so relative to the outside air, this hot air balloon generally exists in the atmosphere as a relatively low-density gas.

Float with low density.

Dense sinking.

Naturally, it flies.

However, the density of the air at high altitude is getting smaller and smaller, and the buoyancy to the hot air balloon is getting smaller and smaller, so the hot air balloon can only reach a certain height, at this time, the buoyancy is equal to the gravitational force.

The reason why hot air balloons can rise high into the air is with the help of air buoyancy. A hot air balloon is a lighter-than-air flying machine, the upper part is a batting ball suit, and the lower part is a gondola. A hot air balloon uses heated air or some gases that are less dense than the air outside the balloon to generate buoyancy for flight, and its basic principle is thermal expansion and contraction.

Why can a hot air balloon rise into the air?

nbsp;There are two reasons why hot air balloons can rise to high altitudes, one is with the help of air buoyancy, using hydrogen, helium and other gases with a lower density than air to generate buoyancy, so that the hot air balloon can fly. Just like a hydrogen balloon because it is less dense than air, if you don't hold it with your hand, it will fly into the sky.

The power of a hot air balloon

The only flight power of a hot air balloon is the wind, and the hot air balloon must choose a high-altitude air current with the right speed and direction when flying, and follow it to move with it, so as to complete the flight more efficiently. Pilots need to constantly adjust their altitude during the flight to "ventilate the airflow".

Kids, do you like hot air balloons? It's a balloon that uses hot air as a floating gas, and people stand in a gondola and light the fuel canister The balloon will slowly rise up and eventually break off the ground, but do you know why a hot air balloon can carry people into the air? I believe that many friends don't know much, so let me answer your doubts.

Flying into the vast sky like a bird has been a dream of mankind since ancient times. Hot air balloons were the first type of flying machine. On the afternoon of November 21, 1783, the Montgolfier brothers of France finally successfully carried out the world's first manned flight of a hot air balloon at Fort Muette in Paris after repeated trials.

The flight lasted 25 minutes and covered half of Paris. Nowadays, hot air ballooning is a popular sport, and grand hot air balloon festivals are held all over the world. As people cheer as the giant colorful hot air balloons take off into the air, someone may ask:

Why do hot air balloons go up?

Hot air balloons lift off with the help of the buoyancy of the air. The buoyancy of the air on the hot air balloon is equal to the gravitational force of the air expelled. As long as the average density of the balloon (along with the weight it carries) is less than that of air, it will be able to float.

The air inside the balloon expands in volume after heating, and the lower the density becomes, the greater the density difference, and the more heavy objects it can carry. If we don't use hot air, we can use less dense helium or hydrogen to fill the balloon or airship, and we can also get enough lift to achieve flight in the air.

The use of buoyancy has been around since ancient times. When the ancient Greek scientist Archimedes helped King Syracuse solve the problem of the purity of the gold content of the crown, he first discovered the cause of buoyancy, which was called the "Archimedes principle", that is, the buoyancy obtained by an object in a liquid or gas is equal to the gravitational force of the liquid or gas dislodged by the object.

Archimedes' principle has many applications, such as being used to calculate the density of an object and the maximum load capacity of a ship. The life jacket is filled with air, and since air is much less dense than water, it can help the person who has fallen into the water to float on the surface of the water and wait for rescue. Chinese Kong Ming lanterns, used for entertainment or prayer, also use the buoyancy generated by hot air.

Legend has it that Zhuge Liang was once besieged by Sima Yi, and he made a paper lantern with an oil-cotton cloth ball on the lower part, and after lighting the cloth ball, the paper lantern rose into the sky to transmit a distress signal, and finally escaped from danger. The legendary story of "Cao Chong weighs the elephant" is also an excellent example of the clever use of the law of buoyancy.