Everyone knows that the hydrogen balloon will fly upward because the hydrogen in the balloon is lighter than the air and rises with the balloon. Some people think that only things lighter than air can fly into the sky. However, a large passenger plane itself weighs dozens of tons and has to take many passengers and load a lot of goods. How can it fly to heaven?
Of course, the plane is much heavier than air, but the secret of its ability to take off by the lift of air lies in its wide wings. Originally, the wing of the aircraft is not as horizontal as the ground. Its front is slightly tilted and its back is slightly tilted. Before taking off, the aircraft must first taxi on the runway. At this time, the wing quickly passes through the air, and the air will produce an upward lift on it. The speed of the aircraft is faster and faster in the process of taxiing, and the lift generated by the oncoming air on the wings is also greater and greater. When the lift was greater than the weight of the whole aircraft, the aircraft was "lifted" off the ground and flew into the sky.
The reason why planes can fly into the sky is similar to that of flying kites. When flying a kite, you need to have wind and run against the wind, so that the air pushes the kite upward from below, so that the kite can fly higher and higher. Although the aircraft is much heavier than the kite, its take-off speed is much faster than when we fly the kite, and the wide wing receives much more wind than the kite, so it can get enough lift to fly steadily into the sky.
Unexpectedly, such great power is "hidden" in the invisible and untouchable air!