Zhang Nan thought about it, so he decided to use a scientific experiment that modern middle school students know to explain this problem to Sun Simiao. That's right, Zhang Nan was thinking about the experiment of the genius mouse, which was to lock the genius mouse in an airtight container, then put a lit candle in the container, and wait until the candle is turned off, the genius mouse will die.

This indirectly proves that the breathing is oxygen.

When Zhang Nan thought of this, he said to Sun Simiao: "Since Zhenren Sun wants to know, let me tell him what oxygen is." After Zhang Nan finished speaking, he looked at the surrounding environment and found that everyone was still in the Du Mansion, so he said.

"Your Majesty Sun, Lord Du just took a break, so why don't we go to another place to do the experiment." After Zhang Nan said that, Li Er nodded without objection. After all, he was doing the experiment so openly at the patient's house. Although Li Er is the emperor and others will not say anything, if Li Er does this, he will feel that he can't hold his face.

"Well, then go to the military academy. I can visit Chengqian." Li Er said, although Li Chengqian is now in custody and was ordered by Li Er himself, he was his own son after all. Li Er felt a little distressed when he put Li Chengqian in the small dark room for so long.

Soon, the three of them arrived at the military academy and the experiment site was placed in Sun Simiao's courtyard. After all the experimental tools were prepared, Zhang Nan discovered that Li Er had also asked Liu Bing to move a chair for him and sit in the courtyard.

"Well? Your Majesty, aren't you going to see the prince?" Zhang Nan asked at Li Er who was still moving.

"No, no hurry. Cheng Qian can go and see it any time. I want to see what this oxygen is first." Li Er waved his hand impatiently, signaling Zhang Nan not to be slower and start the experiment quickly.

Zhang Nan had no choice but to pick up a sealed porcelain jar and said, "Then I will start now, and the next is the time to witness the miracle." Although Zhang Nan's line was an old saying, it still made Li Er and Sun Simiao stunned.

Since she could not find a transparent container, Zhang Nan reluctantly replaced it with a clay pot. Although Zhang Nan could completely replace two glass containers from the system, Zhang Nan did not want to waste this point. After all, this thing would not be used once. Anyway, it would not affect the experimental results if it could not be seen inside, so Zhang Nan decided to be a Grandet before talking about it.

It is difficult to find rats in military academy because the houses in military academy are cleaned every day, and even if there is no one living there, they have to clean them every day. Therefore, there are fewer rats in military academy, but fewer rats, and more fields are.

The military academy has its own vegetable field, so Cheng Huaimo, who was ordered to catch mice, took no time to catch a bunch of field mice for Zhang Nan.

After tied up all the voles' legs and put them in the pot with the candles that had been lit, Zhang Nan clapped his hands and said, "Okay, the task is done."

When Li Eryi heard that Zhang Nan's experiment was finished, he asked strangely: "Is it over?"

"It's over."

"Where is this... oxygen?" Li Erdao.

"This is not a field mouse breathing inside. The field mouse will die after a while." Zhang Nan said.

"What does the death of the field mouse means?" Sun Simiao asked.

"If you die, it means you have exhausted all oxygen. It proves that everything lives by oxygen. Everyone inhales oxygen and exhales carbon dioxide." Zhang Nan said as if he was rightfully so.

"It's just such a pottery jar. Will the field mouse be suffocated to death if it can't be left in it for long?" Sun Simiao said with a frown. It was obvious that Sun Simiao did not understand Zhang Nan's purpose of this experiment.

"Yes, yes, yes, the reason is similar to suffocating, but suffocating means that the field mice do not breathe oxygen. I just use up all the oxygen." Zhang Nan said with a smile.

"Is there anything different between the two?" Li Er asked.

"This... from the results, there is no difference." Zhang Nan scratched his head. After all, using up all oxygen is to suffocate the field mouse to death. There is indeed nothing different between the two.

"Then what's the point of showing me this thing?" Li Er said with contempt. Zhang Nan did nothing more than prevent the voles from breathing, but it did not prove what oxygen was.

"Damn it, Li Er actually despised him." Zhang Nan said in his heart. After all, Zhang Nan came back with common sense accumulated over a thousand years of later generations. Now Li Er actually despised him. How did this make Zhang Nan speechless?

"But, you still haven't explained clearly what this oxygen is." Sun Simiao looked at Zhang Nan with a big head as if he was asking the bottom of the question.

"You are going to dig to the ancestral tomb." Zhang Nan secretly complained in his heart.

"Oxygen is the air we suck into our body. The air we exhaled is carbon dioxide and other gases. If we are in a house without oxygen, we will die like that field mouse. It's that simple, do you understand?" Zhang Nan said.

"But how do you prove that what we inhaled is oxygen and what we vomited out is that dioxygen or something. If what we inhaled is dioxide or something, what is the explanation for this?"

“…”

Zhang Nan had sacked the power of the nine oxen and two tigers, but still did not explain to Sun Simiao and Li Er what the gas contained in this air component was. In the end, Zhang Nan gave up. Li Er also left to find Li Chengqian with infinite contempt for Zhang Nan.

Sun Simiao stayed in the yard because Sun Simiao wanted to see what the electronic blood pressure monitor that Zhang Nan had been put next to him was.

After this incident, Zhang Nan understood that it is impossible to take one step from ancient science to modern science. It is just like a person cannot take too big steps when walking, because if he takes too big steps, it is easy to get an egg.

Now Zhang Nan feels like she is tying her eggs.

"Rome was not built in one day," Zhang Nan lamented.

"My friend, what kind of horse is this mule and horse? Is it difficult to be a horse born from mules and horses?" Sun Simiao heard an emerging noun from Zhang Nan's mouth and asked impatiently.

"A mule has no fertility because it is a combination of a horse and a donkey and has reproductive isolation." Zhang Nan still knows this common sense.

“What is reproductive isolation?”

"...Oh my God, kill me, I will never show off my knowledge again."

"Hey, my friend, you have to say this clearly. It's not good to say halfway. Isn't it clear if you say it? Don't you have to say it clearly? So you still have to explain it clearly to the old Taoist. If you don't say it clearly, the old Taoist will not sleep well this night. After your teaching today, the old Taoist seems to have seen through what the Tao is that you have been pursuing hard. My friend, you have to explain it clearly."

Seeing Sun Simiao keeps talking in front of him, Zhang Nan seemed to see the Tang Monk who could not stop talking for a moment in "A Chinese Odyssey".
Chapter completed!