Datang: Starting from Li Jiancheng

Chapter 45 Luo Bin talks about pressure

It was too late when Luo Bin reacted and pulled away, he raised his eyes and met Sun Simiao's shocked eyes.

"Miraculous Doctor Sun..." Luo Bin pursed his lips slightly.

With Sun Simiao's ability, he could tell in just a split second that he was not injured, not weak, and even physically strong.

Sure enough, Sun Simiao paused for a moment and cupped his hands at Luo Bin, "Don't worry, Lord Hou, this old man is not a gossip."

Luo Bin nodded reassuringly, "I happen to be fine, so I'm here to teach the children a lesson."

Sun Simiao nodded, "Mr. Wang just played with them just now, and they are resting."

Luo Bin responded, and then followed Sun Simiao into the door.

"Master Hou." Wang Changming's attitude towards Luo Bin has improved a lot.

Luo Bin also smiled back, then glanced at the students, cleared his throat, "Your literature will be taught by Mr. Wang, I am very relieved."

"So today, I'm going to teach you something different."

He basically didn't know anything about the ancient Four Books and Five Classics. When it came to assisting scientific examinations, he couldn't even match Wang Changming's finger.

But he can popularize this modern knowledge to the students.

"Different?" The eyes of the little fat man who caught the toad before immediately sat back on his seat, "Master Luo, what are you going to teach us?"

Luo Bin smiled, and then went to the podium after rectifying the records.

And Sun Simiao and Wang Changming also found a place to sit down, apparently to listen.

Luo Bin cleared his throat, then took out two pieces of paper and dropped them vertically, raised his eyebrows and glanced at the crowd, "You say, if I blow on the middle of these two pieces of paper, what will happen to these two pieces of paper?"

What is the problem?
Wang Changming and Sun Simiao looked at each other in their seats, but neither spoke.

The children in the seats also discussed quietly.

"Both these two pieces of paper will float outward!" This was the unanimous result of their discussion.

"Really?" Luo Bin raised his eyebrows and glanced at them.

Then he blew a breath between the two pieces of paper, and the two pieces of paper were immediately stuck together, "Look, they are all floating inward."

Seeing this, Wang Changming, even the knowledgeable and versatile, was taken aback.

"Why, master?"

"If you don't believe it, you can try it yourself." Luo Bin smiled, and then said to the students.

Hearing this, the students below also took out two sheets of paper, imitating Luo Bin's example, and blew in the middle, and the result was without exception.

"This...what the hell is going on here?" The students all showed embarrassment and looked at Luo Bin curiously.

"This has to do with pressure."

This is knowledge that is not available in this era. No matter how much Luo Bin said, they might not understand it.

He could only simply say: "You just need to remember that the higher the fluid velocity, the lower the pressure."

"Because you blow the middle of the two papers, the flow velocity of the gas in the middle becomes larger, so the pressure is smaller, but the external pressure is normal, and the two papers will be pressed together."

"I say so, do you understand?"

After saying this, Luo Bin pursed his lips and looked at the students.

But I saw them all showing embarrassment, looking like they didn't understand.

"Master, what is this pressure? And this fluid..."

Hearing this, Luo Bin lowered his eyes and thought for a while, and then said: "You can initially understand this pressure as pressure, which is the force acting on the surface of an object from the outside world."

Although it is wrong to say so, it is given to them according to the theoretical lecture notes in the textbook, and they must not understand it.

Speaking of this, Luo Bin took out another piece of paper, "Look, the reason why this piece of paper can hang here is because the pressure on him from both sides of the piece of paper is the same."

"And if we blow one side of him, the gas will flow faster and the pressure will be less on that side, and his other side is normal and will compress it."

After saying this, Luo Bin pursed his lips again, "I said this, do you understand?"

Hearing this, the faces of the students softened a little. Although they still don't quite understand it, they can already understand it a little bit.

Luo Bin nodded, and then drew a wing-shaped figure on the paper with a pen.

Simplifying the principle of airplane takeoff, he said to them: "Look at a figure like this. The bottom is a plane and the top is an arc."

"If you let them drive forward at the same speed, where do you think the gas flow speed will be faster."

There was no concept of air in ancient times, but in the Tang Dynasty, the Taoist Wang Bing of the Tang Dynasty proved the existence of gas when he commented on "Plain Questions".

This question is simple, and several students immediately answered excitedly, "Of course it is the one above, because it is longer."

"Yes, so?" Luo Bin nodded in satisfaction, and continued to look at the students excitedly.

Hearing this, the students frowned, not knowing what to say.

But at this time, Wang Changming, who was a little excited listening to the sidelines, suddenly said: "So the upper fluid flow speed is fast and the pressure is low, and the lower fluid will be pushed upward."

"Theoretically, as long as the speed is fast enough, this thing should be able to take off."

As soon as Wang Changming said this, the eyes of the students lit up.

"Fly? Master, can this thing really fly?"

Luo Bin nodded and said with a light smile, "As long as the speed is fast enough, we can't reach such a fast speed yet."

"But if you can't achieve it now, it doesn't mean you won't be able to achieve it in the future." Luo Bin sighed softly, "So you have to grow up quickly, it may not be possible to research something that flies in the sky, and you can also use this in the future. The principle is really put to use.”

In modern times, the scope of application of this principle is still very wide, not only the wings, but also such a device is usually installed on the car.

This prevents the car from drifting at speed.

The students nodded when they heard the words, "Master, don't worry, we won't let you down when we grow up."

Luo Bin responded with a smile, then pursed his lips and said, "It's getting late, so master will go back first."

"Miraculous doctor Sun and Mr. Wang are very remarkable figures, you must learn from them."

"After a while, you will have junior brothers and sisters coming in. You have to look good for them then."

When a group of young students heard that they would become senior brothers and sisters, they were immediately full of fighting spirit.

Each of them clenched their fists and promised Luo Bin, "Master, don't worry, we will definitely set a good example for our junior brothers and sisters."

"En." Luo Bin nodded in response, and then left after greeting Wang Changming and Sun Simiao.

And Wang Changming looked at Luo Bin's back and sighed softly, and said to Sun Simiao beside him, "What do you think is in the mind of this Marquis? Why is he so smart?"

(End of this chapter)