Hearing Huang Yueying's words, Lu Zhi sneered: "This is impossible, how can there be a lamp in the world that can lift itself into the sky?" ”

Lu Bu smiled beside him and said, "Gong Lu, this kind of lamp really exists, and this incident also really happened, just when attacking Shanyue Lotus Peak." ”

Even if Lu Bu came forward to testify, Lu Zhi still refused to believe it.

"Impossible, absolutely impossible! Seeing is believing, hearing is false. Unless you let me see it with my own eyes, I won't believe it. ”

Lu Bu nodded and said, "Okay, please wait a while, I'll go get the materials, and it will be made soon." ”

After finishing speaking, Lu Bu went out and ordered someone to prepare to make Kong Ming lanterns - well, now it should be said that it is the material for Lu Bu's lanterns.

In fact, there are not many materials to make Lu Bu lanterns, and the production is very simple, and soon someone sent the materials over.

Cai Yong and Cai Yan both gathered around curiously, wanting to see how Lu Bu made this Lu Bu lantern.

In fact, Cai Yong and Cai Yan were both skeptical, and they didn't believe that Lu Bu could make a Lu Bu lantern that could be lifted into the sky, because it was completely beyond their understanding.

Especially when the materials used by Lu Bu are extremely simple.

Lu Zhi watched from the side with a look of disbelief, completely disbelieving.

Lu Bu took the paper and cut it, and soon made a simple Lu Bu lamp, and put candles in it.

"Alright, it's done!"

How simple is it?

Now don't say it's Cai Yong and Lu Zhi, even Cai Yan doesn't believe it anymore, because this structure is too simple, can you go to heaven with a piece of paper and depreciate it casually? Why don't you go to heaven yourself!

"Brother Lu, can this lamp really fly into the sky?"

Lu Bu smiled and said, "I know you don't believe it, now I'll test it for you." ”

After finishing speaking, Lu Bu took Lu Bu's lamp and walked to the courtyard outside, lit a fire, and lit a candle.

Soon, the Kong Ming lantern rose flutteringly, and it became higher and higher, and soon turned into a small black dot in everyone's eyes.

"This, this, can you really go to heaven?"

Cai Yong and Lu Zhi opened their mouths wide, and they were shocked beyond comprehension, and they couldn't come to their senses for a long time.

Even Cai Yan showed a look of disbelief.

After a long while, Lu Zhi recovered, and couldn't help asking, "Fengxian, how did such a simple paper lamp rise to the sky?" ”

Before Lu Bu could speak, Huang Yueying preemptively said: "This is actually very simple, after the candle is lit, it will generate heat, and the air will rise after it is heated, and it will take Lu Bu's lamp into the air." ”

As a result, Huang Yueying's explanation, the three of them couldn't understand it at all.

The three of them glanced at each other, and they all saw the blankness in each other's eyes.

Cai Yong couldn't help but ask embarrassedly: "Miss Yueying, can you explain in detail, we don't understand very well." ”

Huang Yueying said impatiently: "The truth is like this, if you don't understand it, it only means that you are stupid!" ”

Ahem!

was actually despised by a little girl, and she still couldn't fight back, Cai Yong and Lu Zhi both made a big red face.

Even Cai Yan's face was a little unbearable.

Lu Bu said patiently beside him: "Yueying, you are about to be a teacher, be patient." If you were to teach your students with this attitude, do you think your students will learn? When teaching, you must pay attention to the ways and means! ”

Hearing Lu Bu's words, Huang Yueying immediately said obediently: "Oh, Brother Lu, people know!" ”

Lu Bu turned his head to Cai Yong, Lu Zhi and the other three and said, "Duke Lu, uncle, you must have seen the scene of boiling water. Have you ever wondered why water boils when it boils? ”

Hearing Lu Bu's inquiry, Cai Yong and Lu Zhi couldn't help but be stunned.

What's there to say about this, the water has to boil when it boils, it's supposed to be like this!

But is it really that simple?

If it was really that simple, would Feng Xian still ask so solemnly?

For a moment, the three of them couldn't help but fall into deep thought.

Lu Bu explained: "Also, let's put a cup of hot water for a while, and when you drink it again, you will find that the water on it is warm, and the water below is cooler." ”

The three of them had experienced this phenomenon, and when they heard Lu Bu say this, the three of them couldn't help but nod.

Lu Bu continued: "This is because of thermal expansion and contraction, after the object is heated, the volume will become larger, the weight will become lighter, and it will rise. So when you drink water, the water above is lukewarm, and the water below is cold. ”

"It's the same with boiling water, the water at the bottom of the pot will rise rapidly when heated, so the water will boil! The same is true for the Lü Bu lamp I made, after lighting the candle, the air expands when heated, and then the Lü Bu lamp rises into the air. ”

Lu Bu explained in great detail, but the three of them still didn't seem to understand, and they didn't understand too much.

Lu Zhi couldn't help asking, "Feng Xian, we understood what you said about boiling water will boil." But this Lu Bu lamp is different, obviously a candle is lit, nothing else? What kind of air are you talking about? ”

Well, the concept of air hasn't been proposed yet!

Lu Bu explained: "The air is formless, colorless, odorless, invisible and intangible, filling the heavens and the earth, but it is indispensable. What we breathe all the time is the oxygen in the air. ”

For the concept of air, it is difficult for three people to accept it for a while.

But Lu Bu's last sentence made them look thoughtful.

Everyone breathes all the time, and if there is no air, what are they breathing?

Lu Bu continued: "The natural sciences that I am going to set up are to study these things. Most people are accustomed to what is happening around them, but in fact, there are often certain patterns in it. ”

"For example, why does the sun rise in the east and set in the west? Why does water flow lower? What will thunder in the summer? What will it rain? What will snow in winter? ”

Listening to Lu Bu's words, Lu Zhi and the other three couldn't help but fall into deep thought.

After a while, Lu Zhi bowed deeply to Lu Bu and said sincerely: "Listening to your words is better than reading for ten years!" Feng Xian's words are really like a dusk drum and morning bell, which has benefited the old man a lot! ”

Lu Bu hurriedly helped Lu Zhi up, and said with a smile: "Lu Gong, don't be like this, it's really tormenting me." The so-called hearing the Tao has a precedence, and there is a specialization in the arts, even if it is a saint, it cannot be omniscient. In fact, these are just some partial knowledge. ”

In fact, natural science is definitely not a partial discipline, but in this era, no one has been able to realize the importance of natural science.

Lu Zhi said solemnly: "Natural science is by no means a partial study, and the old man has a hunch that natural science will soon be able to show its great effect. ”

……

In the end, it was decided that Lu Zhi would be the principal and Cai Yong would be the vice principal.

Because Cai Yong was Lu Bu's father-in-law, Lu Zhi tried his best to push it, but Cai Yong refused because Lu Bu's dictionary had not yet been completed.