Seeing that the sun was rising, Li Kuan arranged for everyone to go to the canteen of Guanshishan Academy to eat.

Most of these people have never been to the cafeteria to eat, but they are also excited to join in the fun.

"Your Majesty, His Royal Highness the King of Chu is worthy of being the God of Wealth of the Tang Dynasty, I heard that just by selling microscopes, there have been more than 20,000 yuan of income. Although 20,000 yuan does not seem to be much compared to the more than 200,000 yuan a day income of the grandfather clock, it still makes me admire it. ”

The eldest grandson Wuji sat next to Li Shimin, talking there with praise and seeming praise.

Fang Xuanling was originally holding a piece of braised pork into his mouth, and after listening to the words of the eldest grandson Wuji, he couldn't help but look at him more.

In fact, he also didn't understand it, it stands to reason that the eldest grandson family and the Chu Wangfu don't have any deep hatred, why has the relationship between the two families not improved significantly?

It seems that whenever there is an opportunity, the eldest grandson Wuji wants to suppress Li Kuan.

This Fang Xuanling's understanding of the wise eldest grandson Wuji is a bit inconsistent.

"I heard that the lens of the microscope requires a seventh-level worker like Chen Dali to grind it, which is very difficult, and the output is very low, and the price is inevitable."

On one side is his brother-in-law, and on the other side is his own son.

Li Shimin is naturally on Li Kuan's side.

"That's right, but His Royal Highness the King of Chu's ability to turn stones into gold is really admirable. The same piece of glass, after his processing, becomes priceless, if one day the household department is short of money, let him go to the household department Shangshu, His Majesty estimates that there is no need to worry about running out of money. ”

The eldest grandson Wuji felt Li Shimin's favor for Li Kuan, and he was a little more worried in his heart, but he still smiled and joked on his face.

"Kuan'er, come over and sit down and eat together."

Li Shimin raised his head and found that Li Kuan seemed to have just finished his work.

He knew that there was a special experiment for everyone to watch after eating, and it was estimated that Li Kuan was arranging the experiment just now.

It is rare to see Li Kuan's busy appearance, and Li Shimin is quite pleased.

However, this expression was seen by Li Chengqian and Li Tai on the side, but it was very pleasant.

"Your Majesty, how is the cooking skills of the Guanshishan Academy? It's kind of to everyone's taste, right? ”

Li Kuan was also not polite, and found a place to sit down near Li Shimin.

"When it comes to eating, who is better at it than you? I've heard that the cooks in Guanshishan Academy are all trained by the chefs in your palace. ”

Although Li Shimin has eaten a lot of delicacies from the mountains and seas, he still finds it quite interesting to occasionally try the daily meals of the students of Guanshishan Academy.

This is just like the fact that in later generations, everyone ate too many kinds of chicken, duck and fish, and began to like to eat wild vegetables that were only eaten by the poor in the early years.

Change the flavor from time to time, and it will be more fresh.

"Second brother, my father and so many ministers are here today, if there is nothing special about your experiment, it is better to let everyone disperse after eating, so as not to delay so much time."

Li Tai felt that Li Kuan had eaten up all the limelight today, and his heart was not very happy.

Besides, at this time, when he was most favored by Li Shimin, few people in the Manchu Dynasty could let him look up to him.

"Your Majesty, if the microscope and microbes in the morning made everyone realize that there are many things in the world we live in that we can't see, then the experiment in the afternoon is to prove to everyone that the space we live in is full of air. And this air has a very huge pressure, and this pressure is far greater than everyone imagined. For example, each of us is actually under the pressure of more than dozens of horses at any given moment. ”

"Poof!"

Before Li Kuan's words were finished, the eldest Sun Chong on the side couldn't help laughing.

A mouthful of soup that had not yet been swallowed squirted out.

"His Royal Highness the King of Chu, are you telling a joke? Everyone is under the pressure of dozens of horses all the time, wouldn't that have become a meatloaf a long time ago? Who in this world is still alive? ”

Although Changsun Chong's action was relatively rude, it was said to everyone's hearts.

If microbes are already an unthinkable thing, then the current air pressure is even more exaggerated.

Dozens of horses!

That's got to weigh that.

"Kuan'er, let's not talk about what the air is like. Even if it does exist, it should be light and fluttering, where is there so much pressure. ”

Li Shimin also asked suspiciously.

However, Li Kuan did not defend himself.

This kind of thing, if it were only useful by mouth, the experiment of the historical horse-drawn copper ball would not be so famous.

Li Kuan smiled and said, "Your Majesty, whether there is pressure in the air or not, you will know when you watch the experiment in the afternoon." No matter how much Weichen explains now, everyone must not believe it. After all, there is no basis for words. ”

"When the Science magazine of Guanshishan Academy first published articles about microorganisms, few people in the entire Chang'an City believed that this was true. Now His Royal Highness the King of Chu said that there is huge pressure on the atmosphere, although I can't understand it, but I am full of interest in the experiment arranged by His Royal Highness the King of Chu. I'm curious how this experiment leads us to believe that this air really has so much pressure. ”

Fang Xuanling on the side said a word.

Obviously, he has supported Li Kuan from beginning to end.

Of course, this is also because in his opinion, Li Kuan has nothing to do with the prince's competition, otherwise he would not have supported Li Kuan so obviously.

"What Xuan Ling said makes sense, so I'll wait and see."

Li Shimin's self-control is very good, although he is still very curious, but seeing that Li Kuan has no intention of continuing, he will no longer ask.

……

In front of the lecture hall of Guanshishan Academy, there is a rather wide square.

A few hundred meters along this square will bring you to the football field next to the main gate.

In order to let everyone see the experiment, Li Kuan specially arranged it on the football field.

In this way, with the stepped seating arrangement, there is no need to worry about people in the back row not being able to see it.

"Master, everything has been prepared, and the air inside the copper ball has been evacuated according to the method you said."

Liu Yuan and Di Renjie stood in front of Li Kuan, explaining the preparation for the experiment.

In order to make this experiment more successful, Li Kuan specially exchanged a rubber gasket in the system, and then arranged for two copper hemispheres to be cast by hand according to the diameter of this rubber gasket.

A device was also installed in it to assist in the extraction of air from inside the sphere.

With the technology at this time, the ideal vacuum state is naturally difficult to achieve.

However, it is not necessary to have a very high vacuum level to do this experiment, so Li Kuan is not worried that the experiment will fail.

On the contrary, Liu Yuan and Di Renjie looked like they were suffering a little bit from gains and losses.

"Okay, you will command the manpower in a while, and the number of horses will increase one by one, so that everyone can feel what it means to be surprised."

Although Li Kuan had never witnessed this experiment with his own eyes, this experiment was still very famous in history, and he had seen the corresponding records in many books, but he was not worried about failure at all.

If you really want to say failure, it is nothing more than the copper ball that might have taken sixteen horses to pull it apart, but now because the vacuum is not high enough, it can be pulled away with ten or six horses.

But even six horses are enough to surprise everyone.

Because there is no connection between the two copper hemispheres.

Normally, a person pulls it away.

The people who were doing a good job in the stands saw Li Kuan in the field and a few people commanding something.

There was nothing special in the entire football field, except for a large copper ball and a herd of horses.

This makes many people curious, what is this afternoon's experiment?

It can't be His Royal Highness the King of Chu who wants to play copper ball on the football field, right?

I've never heard of this gameplay.

"Your Majesty, Princesses, Everyone, everyone has seen this bronze ball. This is a copper ball formed by two hollow copper hemispheres simply fitting together, and under normal circumstances, as long as you break it slightly, the two hemispheres will be separated. However, I have now arranged for someone to remove all the air from the copper ball through a special method. At this time, who wants to come over and try it and see if they can break it open? ”

Li Kuan raised his voice and said to Li Shimin and a group of ministers.

As for whether others standing farther away can hear it, it doesn't matter so much.

Who made the horn not come out yet.

"I'll give it a try!"

Beside Li Shimin, a loud voice sounded.

Li Kuan didn't expect it to be Zhang Liang himself.

However, it's okay, everyone knows the skills of this national prince, if he can't break it, I don't think many people will think that they can break it.

"Yun Guogong, please!"

Li Kuan didn't have much friendship with Zhang Liang, and even Zhang Liang's eldest grandson almost had a conflict with his entourage when he went to the Future Star Kindergarten to sign up.

So I didn't talk to him too much.

If she has the ability to break the iron ball, then she has to consider whether to pull down the laboratory and slice him!

Zhang Liang ignored Li Kuan and came straight to the copper ball.

I saw him turn the copper ball a few times, and found that these were indeed two hemispheres, and there were no obvious traces of connection in between.

At both ends of the copper ball, two handles are cast, which is very convenient for people to pull.

"Huh!"

Zhang Liang only exerted a little strength at first, but the copper ball did not move.

Immediately afterward, he began to get serious.

The whole person half-squatted there, took a deep breath, and exerted force with both arms, trying to pull the copper ball away.

As a result, even though the green tendons on his forehead have burst out, the copper ball is still as stable as a dog.

"Whew! Call! Call! ”

After tossing like this for a few minutes, Zhang Liang felt that all the strength in his body had been hollowed out, but the copper ball still didn't move.

If it weren't for so many people watching, Zhang Liang didn't believe that Li Kuan would do some low-end hands and feet, and he would have wondered if the copper ball was already connected inside.

Otherwise, if you work so hard, why can't you pull it away?

Zhang Liang still didn't talk to Li Kuan, but after glancing at Li Kuan, he went back with a black face.

"Everyone has seen that the mighty and majestic Yun Guogong has no way to pull the two copper balls apart, and the reason is that the air in the copper ball is emptied. At lunch today, I said that each of us should bear the pressure of the air as heavy as dozens of horses, and no one believed it. Everyone has wondered, under such pressure, aren't we all meatloaf? But we're all fine. ”

It was only at this time that Li Kuan began to talk further about atmospheric pressure.

"It's because the pressure we are under comes from all sides, and that pressure cancels each other out, so we don't feel it at all. But the air inside this copper ball is pumped out, which means that there is no pressure in this copper ball, only the pressure exerted by the outside air on it.

According to what I said earlier, this is equivalent to dozens of horses exerting the same weight on the copper ball. No matter how strong a person is, it can't be bigger than dozens of horses, right? So just now, it's not that Yun Guogong is not strong enough, but that this air pressure is too great. ”

Li Kuan, this can be regarded as giving Zhang Liang a step down.

After all, Li Kuan and Zhang Liang do not have any special hatred, and there is no need to offend a national prince at every turn.

It's not a question of being afraid or not.

Pure is not necessary.

"Now we're going to start experimenting in earnest. There are dozens of horses on this football field, so let's let the two horses each pull one side of a copper ball to see if we can pull the two hemispheres apart. If two horses don't work, we'll have four, and if they don't, we'll continue to add until we can. ”

The experiment with the Mara Copper Ball was simple, and there was nothing particularly important to explain separately.

After Li Kuan finished speaking, he immediately asked Liu Yuan to organize people to install relevant auxiliary tools for the horses, so that they could exert their greatest strength to pull the copper ball.

"That's it! Keep your eyes peeled to see if these two horses will be able to pull the ball apart. ”

"Smack!"

"Smack!"

Accompanied by Li Kuan's voice, Di Renjie and Liu Yuan each whipped the two horses.

The two horses immediately ran forward.

However, it didn't go far, and when the rope was straightened, the speed of the horse's progress immediately stopped.

"Boom!"

Running so hard that they were pulled so violently that both horses almost stood up.

However, the copper ball is still as steady as a dog.

"Huh? Neither of the two horses could pull the copper ball away. ”

In the stands, Li Shimin couldn't help but let out an exclamation.

"Your Majesty, Weichen is curious, how many horses do you need to drive this copper ball."

Fang Xuanling said with a smile on his face.

On the contrary, the eldest grandson Wuji on the side looked at the football field with a complicated face.

Although the experiment was not over yet, he had a hunch that he was going to be disappointed again this time.

This Li Kuan is like the copper ball in front of him, as steady as a dog.

"The strength of the two horses seems to be not enough, so let's add another horse to each side and see if we can pull the copper ball apart."

In the football field, Li Kuan also breathed a sigh of relief.

As long as it doesn't pull it open the first time, the experiment is actually basically more than half successful.

All that's left is to see how far the surprise can go.