The story of Cao Chong calling the elephant is a familiar story.

As the most famous child prodigy during the Three Kingdoms period, Li Kuan naturally knew his deeds very well.

"Cao Chong did not use an iron ship, so how did it inspire you?"

Li Kuan naturally knew that iron ships were completely feasible, and there would basically be no living space for wooden ships in later generations.

But Wang Zhongqi was able to put forward such an idea, but he still wanted to know how he came up with it.

Today's Guanshishan Academy is no longer entirely relying on Li Kuan's guidance to produce some results; it should not require Li Kuan to give advice on everything.

So Li Kuan was still quite curious about the idea of ​​this "iron ship".

"Your Highness of the King of Chu, Cao Chong's story, has heard of many people. Most of them have learned that Cao Chong is so powerful after listening to it. You can think of this method when you are so young. But few people think about it. This method can solve the problem. What is its principle and what is the theory that extends behind it?

The student thought about it and felt that this method can actually be attributed to the 'equal replacement method'. Cao Chong used many stones to replace the elephant, carved marks on the side of the boat, so that the elephant and the stone had an equal effect. Then he weighed the weight of the stone again and again, so that the weight of the elephant could be converted into piles of stones, divided and treated, and this problem was successfully solved.

Although such a calculation method may have some errors when measuring an elephant, the method is very correct. So I further thought about why the ship can not sink in the water? Is it just because it is made of wood?

The same wooden boat can carry different amounts of cargo. For example, some red sandalwood will sink to the bottom of the water by putting it in water, but if it is made into a ship, it can float on the water without sinking. So I think it is not simple because the wood is lighter than water."

When Wang Zhongqi said this, he couldn't help but look at Liu Jie.

He was ridiculing himself at the beginning, saying that the ship made of iron would sink when it was put into the water.

"You keep talking!"

When Li Kuan heard this, he knew a little about what Wang Zhongqi wanted to say, but he still wanted to listen to Wang Zhongqi's ideas in full.

In scientific innovation, you must have your own independent ideas.

Boldly imagine and carefully prove, the path to science is like this.

"So I was thinking that if a boat can float on the water, it should be subjected to a force called buoyancy. When there is no stuff on the boat, the water surface will be far away from the deck of the boat. I think the buoyancy at this time should be less;

When the ship is loaded with many things, the ship's draft will be deeper and the buoyancy will be affected at this time; but if the ship is constantly added to the weight, the ship will eventually sink in the water, because at this time the cargo on the ship is already greater than the buoyancy it receives, so it sinks."

"Wang Zhongqi, according to you, the heavier the weight on the boat, the easier it will sink into the water. The weight of the iron is much heavier than wood. Wouldn't it be put in the water and sink without filling anything?"

Liu Jie couldn't help but interrupt again.

His question is also a question for many people.

It’s really a big deviation from what everyone understands.

"Director Liu, you are half right! The ship does sink into the water after the loading of things reaches a certain level, but it does not mean that the iron ship will sink as soon as it reaches the water. On the contrary, I think the iron ship can do more cargo than the wooden ships."

Wang Zhongqi naturally had to stand up and refute at this time, otherwise if Li Kuan was also deviated by Liu Jie's words, then his ideas would never have hope of implementing them.

"Liu Jie, let Wang Zhongqi continue talking!"

Seeing that Liu Jie wanted to continue arguing with Wang Zhongqi, Li Kuan couldn't help but speak out to stop him.

However, although Li Kuan only said a simple sentence, it raised hope to Wang Zhongqi.

"His Royal Highness of Chu, I think whether the ship sinks or not, and how much its load capacity is, has no necessary connection with what material it is made of, but has a direct relationship with the maximum buoyancy it can be. An iron lump will definitely sink when placed directly in the water, but if it is made into a ship, it is hollow, and whether it sinks should be directly related to the buoyancy it receives."

Wang Zhongqi felt the encouraging look in Li Kuan's eyes, and the uneasiness in his heart slowly disappeared, replaced by expectations.

His Highness the King of Chu is the smartest person in the world. What Liu Jie cannot understand does not mean that His Highness the King of Chu cannot understand.

"I carved a small boat with purple tremolo, which can float smoothly on the water; while the whole rosewood will sink directly into the water. Although rosewood is still different from iron, the logic is the same. As long as it is designed, the iron ship can float completely on the water.

With the development of maritime trade, we need more and more sea boats to travel to Japan and Nanyang, and even to Australia and America; various shipbuilding workshops are also creating more and more large ships that can carry more cargo. However, the larger the ship, the higher the requirements for wood. Ordinary giant trees can no longer meet the requirements of large ships, which will make wooden ships more and more difficult to make.

But if iron plates are used to make ships, as long as the iron plates are constantly spliced ​​together, it will not be restricted by the size of the wood like wood, and there is no need to travel thousands of miles to find giant trees from Liaodong. This is of great significance to further making larger sea boats."

Although Wang Zhongqi's statement was not very logically rigorous, Li Kuan was quite satisfied.

At least his idea is not wrong.

"I think it makes sense that the ship you mentioned is that it is affected by buoyancy in the water, so it can float on the water surface. But have you ever thought about how to measure this buoyancy?"

"His Highness of the King of Chu, the students have been thinking about this issue for a while. The reason why the hot air balloon can float in the air is definitely because the buoyancy force is greater than the weight; the ship is saying that it can not sink inside, because the buoyancy force is greater than the gravity; Similarly, the iron ingot will sink when thrown in the water is less than the gravity.

So I have a guess that the magnitude of this buoyancy may be related to the volume of the object immersed in liquid or air, or to the density of the liquid or air, or to the density of the object and the density of the liquid or air, or to the depth of the object inserted into the liquid."

Since Li Kuan proposed several basic laws of mechanics at the School of Interpretation of Guanshishan Academy and introduced standard units of measurement, Guanshishan Academy has made great progress in scientific research.

Things like the density of objects have gradually been given a relatively standard data as a reference.

So not only Li Kuan could understand what Wang Zhongqi said, but others also basically understood it.

Even Liu Jie's face changed a little at this time.

It seems that my previous judgment was too hasty?

But now that things have come to this point, I can only let Wang Zhongqi continue to talk.

"Bold guesses and be careful to prove it. These are words I have always liked to keep in my mouth. Wang Zhongqi, your guesses make sense, you can try them out. Then what are the results of your recent thoughts?"

"Yes, Your Highness, the King of Chu has a result! Although I cannot accurately measure the buoyancy, I can prove that buoyancy has something to do with, and I can also prove that the iron ship is completely feasible!"

Hearing this, Wang Zhongqi knew Li Kuan's attitude no matter how stupid he heard, and an excited expression began to appear on his face.

Is your iron ship finally going to have hope of realization?

"Oh, how did you prove that the magnitude of buoyancy has something to do with?"

The curiosity on Li Kuan's face was getting heavier and heavier.

This method of proof is easy for Li Kuan, but for people in the Tang Dynasty, if they could find a rigorous method, it would be very different.

"That's right. I bought some springs and simply made a spring side force gauge to measure the weight of an object and the force it is subjected to. Of course, I have to admit that this spring force gauge is not particularly accurate. I have only initially studied the rules of the spring and marked them on the scale. But this is enough to prove what I want to prove."

A shy expression appeared on Wang Zhongqi's face.

Obviously he had not designed a perfect spring dynamometer, which made him feel a little ashamed.

"Well, you keep talking!"

Li Zhong showed an encouraging smile on his face.

"I made two iron and copper blocks of the same volume, prepared a large beaker, filled with half a cup of water, and then hung the iron block on the spring dynamometer and slowly put it into the water. Except for the process of entering the water, the value of the spring dynamometer is constantly changing. When the iron block is completely immersed in the water, no matter where the iron block is, the value on the spring dynamometer has not changed.

After that, I used a copper ball to do this test, and the results were the same. So I concluded that the magnitude of the buoyancy has nothing to do with the position of the object in the water. Whether it is a little deeper or a little shallower, the buoyancy received is the same."

"Don't it be that the deeper the sinking, the greater the buoyancy?"

After hearing Wang Zhongqi's words, Liu Jie couldn't help but ask a question that many people took for granted again.

"I thought so at first, but judging from the results of the experiment, the magnitude of buoyancy has nothing to do with the depth of the object immersed in the liquid."

Wang Zhongqi's face began to become calm.

As long as he talks about specific experiments, his emotions can become very calm.

"Then I continued to confirm the relationship between the buoyancy of an object and the volume immersed in liquid. Obviously, the larger the volume of an object immersed in water, the greater the buoyancy it receives. This method of titting lines on the side of the ship when Cao Chong called the elephant just now is consistent with each other."

"After that, I immersed the iron block in water, concentrated salt water, and oil. I found that the buoyancy force the object was subjected to, which was also inevitably related to the density of the liquid. At the same time, I also discovered the most important law of buoyancy."

When Wang Zhongqi said this, he couldn't help but pause and looked at Li Kuan and Liu Jie.

Sure enough, Liu Jie couldn't help asking: "What's the rule?"

"That is, the magnitude of buoyancy has nothing to do with the density of the object! In other words, under the buoyancy belt of the wooden ship and the iron ship, it has nothing to do with the density of wood or the density of iron! This shows that the iron ship's solution is completely feasible!"

Wang Zhongqi couldn't help but raise his voice.

"Smack!"

Li Kuan did not care whether Liu Jie's face looked ugly or not, but couldn't help but applaud Wang Zhongqi.

This small experiment doesn't sound difficult at all, and you can do it again if you find a student.

But the conclusions drawn are very meaningful.

"Wang Zhongqi, your idea is very clear. I completely agree with your speculation! Next, you can organize your experiments and ideas into a paper and publish them in the journal Science. The college will also allocate a fund to you according to your proposal, so that you can try to study the production of the iron ship!"

Li Kuan's words made many students around him envious.

Since the establishment of the magazine Science, it has become increasingly difficult for students from Guanshishan Academy to publish articles.

Because they not only have to face competition from classmates within the academy, but also competition from everyone in the Tang Dynasty.

Because Science magazine is now open to everyone, whether students from various academies in Chang'an City or craftsmen in workshops can submit their articles to Science magazine for publication.

Once adopted, you can not only get a considerable royalty immediately, but also gain a huge reputation, which can be said to be a gain of fame and fortune.

"Thank you, Your Highness, Your Highness, the students will definitely live up to His Highness, and make an iron ship that can actually sail as soon as possible!"

Wang Zhongqi suppressed the excitement in his heart and bent down to bow to Li Kuan.

"Don't thank me, this is what you deserve! Guanshishan Academy encourages everyone to be brave in innovation and pioneering and enterprising. You can think about your iron ship's solution from several aspects. The first is the connection between the iron plate and the iron plate. What method is the easiest to use? There are also the corrosion resistance of iron plates. Is there any way to reduce the corrosion rate of river water or sea water on the hull? These are all issues that need to be considered. Only by solving these problems can the iron ship truly cross the sea and contribute to the development of the Tang Dynasty."

When Wang Zhongqi was able to reach this point, Li Kuan naturally didn't mind helping him get on the horse and sending him off.

"By the way, I think your spring dynamometer is a good thing. You can study it thoroughly and find the accurate calculation formula for buoyancy. This is very meaningful for the development of Guanshishan Academy of Geography and Physical Sciences!"

Before leaving, Li Kuan made another request.

The Tang Dynasty now lacks essential experimental equipment. If we want to promote the development of science and technology, basic experimental equipment is indispensable.

"Your Highness of the King of Chu, why would the academy specialize in allocating a yard to Wang Zhongqi to study the spring force gauge? You can even help him set up a Zhongqi production center to study these things."

Liu Jie knew that he had lost points in front of Li Kuan today, so he hurried out to rescue him.
Chapter completed!