I heard Zhang Mingwei say to them: "Now, two people come and pull them down together to see if they can pull these two hemispheres apart?"

When he heard this, Fang Kongzhao and his son looked around and raised their hands first.

These habits were obviously developed through Zhang Mingwei's usual teachings.

Du Yinxi looked at Fang Kongzhao and his son coming forward, and smiled and said to Emperor Chongzhen, "No, they can't both of them open up, right?"

If you think about normalcy, these two hemispheres will fall by themselves. But it is not fallen; this is already a bit strange. If someone goes to pull it, it will definitely be pulled away!

However, judging from Duke Xingguo’s habits, it is likely that he cannot pull it away.

This is hard to imagine, but it can be guessed from Duke Xingguo's words and deeds.

As for those who were recommended by Zhang Mingwei's disciples, I don't know Zhang Mingwei's habits, so I don't believe it. How could I not be able to pull it away when two adults go?

As a result, at the beginning, Fang Kongzhao and Fang Yizhi and his son pulled them down randomly, but they didn't pull them away. Then, they both started to pull them hard.

It can be clearly seen that both of them turned red after being held back, but they still didn't pull away.

This time, everyone who saw it was surprised.

"What's going on? Didn't both adults get stuck?"

"Is this the power of air that the Duke of China calls? How could there be such a great power? It's incredible?"

"Yes, we don't feel it at all, why does the air have such great strength?"

“…”

Amid their discussions, Fang Kongzhao and his son reluctantly admitted that they could not pull them away.

So, Zhang Mingwei casually called two tall and powerful Jinyiwei Captains and asked them to come and pull them, but they didn't even pull them away.

Before this was over, Zhang Mingwei continued to order: "Go and lead the horse over!"

So, under the gaze of everyone, eight tall horses were pulled over by the Jinyiwei School Captain, and everyone was stunned.

"What does it mean? Just this, you have to use a horse to pull it away?"

"No, eight horses, isn't this too exaggerated?"

"Duke, is this air strength that great?"

“…”

Zhang Mingwei smiled but said nothing at all at the surprise of their voices. He just directed the Jinyiwei lieutenant to arrange four horses. After he was ready, he started the "tug-of-war" competition.

Everyone stared at each other, including Emperor Chongzhen, and they vaguely felt that the results of the experiment might still be beyond their cognition.

Sure enough, eight horses drove away in two directions. It was obvious that the eight horses were all exerting force. As a result, the two hemispheres were still motionless and were not pulled apart!

After waiting for a long time, I still didn't see any trace of being pulled apart.

These people who watched it were "exploded".

"How is this possible? Even eight horses can't pull it away! Is this too exaggerated?"

"The air has such a lot of strength? Why do I feel nothing at all?"

"If I hadn't seen it with my own eyes today and others told me this scene, I would never have believed it!"

“…”

These people for a moment forgot that the emperor was watching, and they were surprised by the scene in front of them, which really exceeded their perception.

After they discussed for a while, Zhang Mingwei saw that the experiment had caused enough surprises, so he ordered the Jinyiwei owed eight horses, a total of sixteen horses to pull these two hemispheres.

Under the force of eight horses on both sides, the two hemispheres finally opened. A sound of relief immediately sounded at the scene, and finally opened.

Zhang Mingwei smiled and patted his hands and said, "Okay, it's cold outside, let's go inside and talk!"

In fact, all of these people who watched the experiment were very excited and felt cold. However, the Duke of the State said they wanted to go inside to speak, so they were of course obedient. Many people were holding on to questions and asked questions immediately after they were waiting to go in.

Sure enough, after they sat back, Zhang Mingwei asked if he had any questions, and they all raised their hands to ask.

The question is nothing more than why the air has such great strength and why sixteen horses need to be used to break this problem.

After hearing this, Zhang Mingwei smiled and said to them: "You can see in this experiment just now that after the hemisphere was pulled open, there was no water inside. This means that there is actually no air inside, but a vacuum inside, which means there is really nothing."

Afterwards, Zhang Mingwei popularized the concept of atmospheric pressure to them. With the experiment just now, he explained this scientific concept and it was easy to be accepted by the people in front of him.

This hemisphere experiment, originally called the Maddleborg hemisphere experiment in history, took place in 1654. Just like that, it was taken first by Zhang Mingwei! Of course, the name is no longer called the Maddleborg hemisphere experiment, but the Marat hemisphere experiment.

Listening to Zhang Mingwei's introduction, everyone suddenly realized.

"We usually don't feel the strength of the air. It turns out that because we are in the air, the strength cancels out each other!"

"I really didn't expect that the air is so powerful, it's incredible!"

“…”

Zhang Mingwei heard their sudden realization and suddenly asked another question: "Who will tell me how should we calculate the air pressure? Also, in the experiment just now, no one questioned whether the two hemispheres were really vacuum after the water was gone?"

When everyone heard this, they were stunned because they couldn't answer it. Because of Duke Xingguo's authority, they had never thought about the subsequent question.

After Emperor Chongzhen and Zhang Mingwei had been in contact for a long time, they immediately guessed his intention and immediately asked excitedly: "Sir, do you want another experiment?"

For experiments beyond cognition, as long as people are curious, whether they are emperors or ordinary people, they all want to see them.

After hearing this, Zhang Mingwei smiled slightly and said, "Yes, I can do another experiment to answer this question."

After saying that, he asked Zhu Mi to take out a stack of things and send one for each person.

When everyone saw that it was a mask, they all felt a little confused. However, the Duke Xingguo issued it with his intention, so they all put the mask on like Duke Xingguo.

Then, Liu Jin, who was also wearing a mask, brought a long glass tube and a basin of mercury.

Zhang Mingwei looked at them with a much more serious expression and said to them: "This mercury is actually harmful to the human body. It will evaporate at room temperature. After being inhaled into the body, if it takes a long time and lasts for a long time, it will be poisoned."

Speaking of this, he smiled again. Although he was wearing a mask, he could still see that he was smiling: "But this mercury will not evaporate on this snowy day, but for safety, it is better for everyone to wear masks. Now, let's do the experiment."

He didn't care if Duke Xingguo was so close to Mercury, so they would definitely not have any problems if they were farther away. Therefore, no one was worried about safety issues.

This is why Zhang Mingwei has a high status. Otherwise, if he believes it or not, he will have a censor who puts a hat on him, saying that he wants to harm the emperor, or something, it may happen.

At this time, the people present were watching the next scene seriously.

Zhang Mingwei first filled the mercury tank with a mercury surface above the mercury surface until the entrance of the tank was filled with clear water, then picked up the very long glass tube, filled the glass tube with another spare mercury, and then pressed against the tube mouth with his fingers.

After doing this, Zhang Mingwei said to others with a smile: "See, the inner circle of this glass tube is mercury, and there is nothing else. Next, you guys are optimistic!"

It’s really because the glass technology tree was first pointed out, so the experiment can be viewed more intuitively. Otherwise, the two iron balls just now would not be able to see the situation inside at all.

Everyone was watching seriously, and then Duke Xingguo turned over the glass tube filled with mercury, then inserted it into the mercury tank containing mercury, and put it all the way into the mercury layer inside. Then he heard Duke Xingguo remind him again: "Okay, you guys are ready!"

The mercury tank is placed on the table, so people under the underworld don’t have to stand up and you can see it even when you sit there.

After Duke Xingguo let go of his finger, he immediately saw the mercury on the top of the tube falling down, leaving a piece of space inside the tube with nothing, while the lower part was still full of mercury.

"Now you can be sure that there is nothing in this empty space, right? If you don't believe it, you can continue to look down!" Zhang Mingwei said, and slowly lifted the glass tube upwards.

Emperor Chongzhen and others stared at them without blinking, curious about what would happen next?

When the glass tube mouth was raised above the interface between mercury and water, the mercury in the tube immediately poured out, and the water suddenly rushed upwards into the tube until the top of the tube.

"How is this place that was empty just now, it can be proven to be empty, right?" Zhang Mingwei asked with a smile.

After watching the entire experiment through a transparent glass tube, I naturally got this result intuitively. Everyone nodded in conscientiously: the part above the mercury column in the tube was indeed space without anything, that is, the vacuum.

Then Zhang Mingwei also conducted several experiments to let everyone see that no matter the length of the glass tube or the degree of inclination of the glass tube, the vertical height of the mercury column in the tube is always 76 cm.

After doing all this, Zhang Mingwei asked someone to pack up the experimental equipment and finally explained to them: "The experiment just now can prove that the air pressure is strong. In addition, the height of this mercury column can also be used by us to measure how strong the air pressure is!"

He actually had this experiment in the West. It was probably the last few years when Zhang Mingwei was busy leading troops to fight. He was experimented by Italian physicist and mathematician Evangelista Toricheli, and made a mercury barometer.

It has to be said that if Zhang Mingwei had not appeared in this era, Westerners had begun to surpass the East in terms of science.
Chapter completed!