Heavenly Dao Formula Chapter 241: To take off
This is a classic air pressure test.
The most technologically advanced device is probably this glass. It was also made by Xia Fan commissioned by Luo to lightly fired it with dragon scales. Although it showed a deep green color due to the impurities in the sea sand, it did not hinder its excellent light transmittance.
Put the four candles in a basin filled with water, then light the candles and buckle the glass upside down.
Under all eyes, the candle quickly ran out of oxygen and went out.
Then the water surface inside the cup rises rapidly at a speed visible to the naked eye.
In less than a few breaths, the water pouring into the cup crossed the basin outside and rose to almost one-third of the wall of the cup. From a distance, it looked like a new one had risen in the basin. Hill".
Before that, the inner and outer waters were still on the same level!
"How does this water... move?"
"It feels like being sucked up by something!"
The interest of the children was immediately mobilized.
"You guys may wish to think about why this phenomenon occurs." Xia Fan once again looked at the crowd-in fact, he arranged for the privy government among the observers to prevent no one from answering. Leading to the cold spot.
But this time someone gave the answer in advance.
"What do you want to say is that the gas in the bottle is exhausted, causing the outside gas to squeeze the water surface and push the water into the bottle?"
"Correct." Xia Fan followed the prestige with a little curiosity, and it turned out to be a little girl. Seeing her location, it should be a guest invited by Fang Xiandao.
To be honest, although this experiment is a classic, it is not as shocking as a hemisphere experiment. It takes a circle to understand the principle. The other party seems to be young, but can think of this level quickly, is it - she is also a living dead?
"Then, can I ask a few more questions?" Qianyan got up from the chair, which made her suddenly shorter. "The person in front, please let me."
Probably I have never seen such a magnificent little girl, everyone involuntarily vacated a passage.
"Sir Qianyan..." Fang Yanni's face turned pale.
"Don't worry." Fang Xiandao calmly said, "The Xia Fan I know is not the kind of person who bullies others."
On the other side, Xia Fan nodded with interest, "Of course, you said."
"Since there is pressure in the air, why don't we feel tired, even if we relax, we won't be crushed?"
"The same reason as this bottle, because we also have air in our body, which is offset by the inside and outside. If the air is taken out, the weight is enough to press a person."
"What the **** is the air? Is it physical? Can it be directly touched?" Qianyan asked.
If it is the past theory of fictitiousness and realism, you will definitely avoid answering such questions directly, and instead talk about some mysterious and mysterious principles.
"Of course it does." However, Xia Fan did not forcefully change the subject. "You can understand gas as a thinner water, so when the temperature is low enough, it will freeze like water and change Become a visible'ice lump'-I think at that time maybe you can see more intuitively that you are touching an entity."
"The air-can it be frozen?" Thousands of words couldn't help being stunned. She didn't expect that she would get such an answer, "How low is the temperature?"
"It is much lower than the freezing point. This temperature may be difficult to achieve at the moment, but as long as you work hard in this direction, I think you should be able to see one day-frost is not the water vapor floating in the air Does it condense into ice?"
Qianyan showed a contemplative look, and after a long time she looked up, "These are all your speculations, right?"
Xia Fan did not deny it.
She hesitated, "That is to say... It is still doubtful whether the conclusion is correct."
"I know it is really unimaginable. This is also a great pleasure of studying things: from the details that can be seen everywhere, the principles behind things are deduced and applied to a wider range of fields, even if it is counterintuitive." Xia Fan turned to Interested students, "Everyone is quiet! I also prepared another experiment, which will let you see that not only does the air fill the surrounding like water, but people can also use it to do incredible things!"
This experiment is no longer confined to the glass bottle, but takes the world as the stage.
A simple air pressure fun experiment certainly can't satisfy Xia Fan. He strives to make this public class the first shot in the school's reputation, so he didn't leave any hands.
To show the charm of air, what can be more influential than the representative machinery that integrates various aerodynamic studies and represents the conquest of the sky by humans?
At his sign, two guards carried a biplane into the entrance hall.
Although its size can only be said to be at the level of a model, it instantly attracted everyone’s attention with its unique shape. At first glance, it looks a bit like a kite, but everyone quickly realized that it is much thicker than a kite. Nearly half a person tall, the two wings are more than one arm. This thing doesn't move when it is placed on the ground, and its weight is evident.
The next step is to build a runway about 100 meters long with smooth wooden boards.
Xia Fan originally thought that the key to the biplane model is that the electric motor is difficult to polish by hand. As a result, Mo Yun gave him a surprise. The slender iron rod used as the rotor is the latter relying on precise hands. Shaving and shaping. In contrast, the copper wires and magnets surrounding the rotor are only the experience accumulated in the four-wheel drive era, and it does not take much effort.
To provide energy for the engine are two sets of earth-method capacitors. They are made up of layers of gold foil and lacquer paper. In order to prevent the insulation layer from being broken down, the surface of these lacquer papers is also coated with sealing wax to ensure that the electric charge will not fly up and down.
Charging the capacitor is a single streamer technique. Even after thousands of shaking operations, Xia Fan burned several prototypes before he mastered the strength of charging the local capacitors.
Of course, he can also hold the wire in his hand to directly provide energy for the model machine, but this kind of "wired remote control" is reminiscent of a kite, which inevitably lacks the feeling of freedom to chase the wind.
"What is this?" Qianyan couldn't help asking.
"A vehicle that allows people to fly in the air, but it is only a model now."
"Soaring...in the air? You mean ~IndoMTL.com~ can it fly?"
This sentence is also everyone's question, after all, the model machine looks too heavy and clumsy.
"It is precisely because the air flows like water, so as long as it is used properly, it can hold things hundreds of times heavier than itself, just like a ship with a heavier weight can only float on the sea." Xia Fan smiled Replied. Seeing that everything was ready, he pulled down the switch that connected the circuit.
The blades located in the nose of the aircraft spun rapidly and made a huge hum!
The motor does not need assistance. As long as there is power supply, it will run with maximum distortion.
Driven by the propeller, the biplane began to advance slowly and faster and faster. Until the pressure difference between the upper and lower wings exceeded the weight of the airplane, it seemed to be lifted up by a pair of invisible hands, suddenly left the ground in the incredible eyes of more than two hundred people, and soared into the air!
The scene was silent for a while.
Xia Fan knows that two sets of capacitors can only run for tens of seconds, after which it will fall to the ground under the pull of gravity. But just these tens of seconds is enough to leave an indelible impression in people's hearts.