It took Fang Jing nearly an hour to cook the meal, and there were more styles of dishes, at least today could be regarded as receiving the four Qingque, otherwise, dinner would basically be made by Zhang Xiaoxia.

"Brother Jing, this meat is delicious, Sister Dexian, Sister Meng Jiang, you eat it quickly." Li Zhi said to Fang Jing excitedly, holding a piece of braised pork with chopsticks in her hand and sending it to her mouth.

"Thank you, Brother Jing." Li Dexian and Li Mengjiang looked up at Fang Jing and said.

Fang Jing actually began to complain a little about Li Shimin in her heart, how old are these two little babies, they were sent to the Fang Family School when they were more than five years old, what kind of person is this, do you regard the Fang Family School as a kindergarten? This is a school, but it's not a nursery school.

"If it's delicious, eat more." Zhang Xiaoxia looked at these two cute little dolls, and she was also unhappy, and she was probably thinking in her heart, how could this parent be so relieved that their children would be sent to the Fang Family School, even if there were entourage guards or something, they were just young children.

"Brother Jing's dishes are delicious, beautiful, you are not allowed to rob my braised pork." Qingque and Lizhi stretched out their chopsticks, grabbing the braised pork in the puck, and they were about to fight.

"Brother Qingque, this is a piece of meat that I saw." Lizhi is not afraid of the green sparrow, staring at the green finch with two big eyes, pouting and shouting at the green sparrow.

Zhang Xiaoxia was serving vegetables to the other two little babies, looking at this scene, she smiled knowingly, but her own little babies didn't need her to take care of them, the youngest were eight years old, not to mention that they used to eat separately, of course, except for Fang Yuan.

Fang Jing didn't speak, taking care of herself with the dishes, eating, not knowing what to say, and not knowing how to deal with these little babies, but thinking that Li Shimin dared to send these two little babies to the Fang Family Academy, he naturally made full preparations.

After dinner, after almost resting, Qian Shi came to Fang Jing's house with a few entourages and led the four little babies back to the townhouse.

On the afternoon of the third day, it belonged to Fang Jing's class, and Fang Jing was temporarily arranged to attend class on the last afternoon of every five days, so this afternoon belonged to Fang Jing's class.

After receiving the pen, ink, paper, and inkstone this morning, Qingque was assigned to three classes, and Qingque was naturally assigned to the large class, while the other three were assigned to the small class, because of the number of people, a few people were finally adjusted, which made a full hundred people, divided into three classes.

Fang Jing was carrying a basket, and in the basket were some things that needed to be used for lectures, bottles and cans, and some other things, of course, these things were all for the dumb immortals, otherwise, Fang Jing's lesson would have no meaning.

Fang Jing carried the basket to the steps of the podium in the big classroom, put down the basket, and looked up at the entire large classroom, but he didn't expect that there were three gentlemen sitting in the back, as well as Muramasa and Xiaoshi, which made Fang Jing start to play the drum in his heart.

Fang Jing herself has never been a teacher, and she doesn't know how to teach, but there is a saying, 'If you haven't eaten pork, haven't you seen a pig run?' Fang Jing settled down, took a bamboo stick he had prepared, and prepared to start today's lecture.

"Good afternoon, students." Fang Jing opened her mouth and shouted to everyone in the big classroom.

"Good afternoon, sir." The students stood up and shouted after bowing to Fang Jing.

"Sit down, I'm here to teach you this afternoon, so listen well, watch well, feel well, and next, I will take you into a magical world." Fang Jing waved her hand and asked the students to sit down.

After Fang Jing finished speaking, he took a big transparent beaker from the basket and put it on the podium, which was just a desk, ordinary.

took a bamboo bucket and poured half a beaker of water into the beaker, and prepared all kinds of things that needed to be experimented, all of which were placed on the podium, because after a while, Fang Jing was going to pass these things and do a small experiment for the students, and then took a piece of chalk and wrote a word on the blackboard, water.

Whether it was the students in the big classroom, or Mr. or Lord, they didn't know why, but when they saw Fang Jing's beaker, they were shocked, and wondered in their hearts, how could there be such a beautiful glass in this world, transparent and nothing, as if it were made of nature, it was really a treasure in the world.

"We all know that we need to drink water every day, and if we don't drink it, we will be thirsty, but does anyone know where most of the water in this river comes from?" Fang Jing began to lecture, and the words she spoke were also understandable to the students.

"Mr. Fang, this person is naturally inseparable from water, and he will inevitably die if he leaves the water, where does this water come from, it must be formed from the ground, and the water formed after emerging from the ground will accumulate into a river." Yu Li stood up and responded to Fang Jing.

"Mr. Yu is right, some of this water comes down from the ground, but the water in our common rivers is formed by the melting of ice and snow on the snow-capped mountains, and flows into various rivers and rivers, which forms the great rivers seen in this world." Fang Jing spoke again.

"Water, the source of all things, people, animals, plants and other things, are inseparable from water, and today, what I need to talk about is also related to water, next I will put the egg that the hen just laid into the water, may I ask everyone, will the egg sink or float up?" Fang Jing took an egg from the podium and asked the students in the classroom loudly.

"Sir, I know, the egg will surely sink." Qingque replied after standing up.

"Sir, I also know that eggs will sink." Rei replied.

"Okay, sit down, that's right, after the egg is put in this cup, it will naturally sink, so that it will sink as everyone sees." Fang Jing asked the two little babies to sit down, and then put the eggs into the beaker, and the eggs also sank.

"So then, if I pour some salt into the water, will everyone think that the egg will sink or float?" Fang Jing took a bag of refined salt from the podium and asked everyone.

"Mr. Fang, if you pour some salt into this water, it will naturally be impossible for the eggs to float." Qin Shu felt that Fang Jing's way of teaching was a little unacceptable, whether it was a lecture or a deception, he began to feel a little unwilling to listen.

"Mr. Fang, salt is a precious item, even if you pour all the salt into this water, this egg will not float." Yu Li also began to get impatient.

"So what will happen when you wait a while? I'm going to pour the salt into this glass of water and melt it, and see if the eggs sink or float. Fang Jing didn't say anything anymore, poured the salt into the cup, and stirred with the bamboo branch until the salt melted.

"How is it possible, how is it possible." Qin Shu had already seen the eggs in the beaker float.

"Impossible, how can this egg float in this water?" Yu Li stood up and stared at the eggs in the beaker on the podium, looking panicked.

"Sir, may I ask why this egg was obviously sunk in the water just now, why does it float after adding salt?" Qingque looked at the scene that had just happened in front of her, she was very curious and puzzled, could it be that Fang Jing would cast a demon spell?

"Let's all sit down, this egg floats, it's actually very simple, but everyone doesn't know it, because I add some salt to the water, and I change the state of the water, that is, after pouring salt into the water, the density of the water is changed, do you understand?" Fang Jing didn't know how to explain the process.

"Mr. Fang, can I change the state of the water after adding salt? But we see that the water is still very clear, and it has not changed. Yu Li said.

"Sir, what you said just now is changing the state of the water, saying that it changes the density of the water? So what is this density? Qingque asked very curiously.

"......" A large group of people got up and asked Fang Jing.

"Okay, finally someone asked the point, just now I said that the salt water is added to change the density of the water, and any object has a density, people also have it, iron also has it, and stones also have it, and if the density of water is one, then the density of the salt water may become three, then when the density of the egg is only two, the egg will naturally float on the salt water, and when it is greater than the density of water, it will naturally sink to the bottom of the water."

Fang Jing explained like this, thinking that everyone should have understood, but as for what the density of Fang Jing said, maybe everyone didn't know.

"Sir, how do you know about density?" Qingque asked.

"That's right, Mr. Fang, how do you know the density you said?" Yu Li also asked, although he studied the four books, but he didn't know about these scientific experiments, but people will always be curious.

"Okay, then, I'm going to tell you how to measure the density of an object." Fang Jing didn't know how to measure density, but fortunately, when Fang Jing was compiling the textbook, he remembered that he seemed to have learned this knowledge in his previous life, but because he hadn't reviewed it for a long time, he naturally forgot about it.

Fang Jing took a test tube, poured half a tube of water, and then took a piece of iron tied by filament, facing everyone in the classroom.

"Look, I have half a tube of water in this tube, and the value at this time is three, and when I put this piece of iron into this tube, the value at this time is five, and the weight of the piece of iron in my hand is two." Fang Jing said while doing the experiment to everyone, and then put down the things in his hand and took the chalk.

"Then, the density should be calculated in this way, the iron block of two, removed, the value of the iron block just now put into the water pipe is five minus the value of three before the iron block is not put in, that is, the weight of the iron block is divided by two (five minus three), then, the density of the iron block should be one." Fang Jing wrote the values of the entire experiment on the blackboard and calculated. (Numerical pure numbers are fictitious, and the author only uses this method to illustrate the method of calculating density.) ）

"Sir, does this density do anything?" The blue finch wanted to know what effect it could play since it could calculate the density of various objects and densities.

"Qingque, you asked very well, this density, in fact, can still play a lot of role in our lives, for example, when merchants buy and sell, whether the content of gold, silver and copper coins can meet the requirements, such as when we build the city wall, the materials we need can be calculated, and the larger direction is to help explore, the secrets of matter, and the secrets of the whole world."

Fang Jing is not a scientist, so naturally he can't do the state of research, and it is impossible to go beyond what he can explain, so he can only rely on various teaching materials in the future.

There were a few gentlemen and Muramasa Xiaoshi sitting behind, staring at Fang Jing with empty eyes, they didn't know how to describe it, the three gentlemen were completely in the clouds, they understood it, but for those of them who studied Confucianism, it was a little useless, but in their hearts, they were very curious about Fang Jing's knowledge, and Muramasa and Xiaoshi couldn't understand that Fang Jing's mind really understood this knowledge from the moment he opened his mind, but even they didn't understand it, except for curiosity in their hearts, there was only curiosity.

The students in the big classroom stared at the beaker with curiosity on their faces, although they understood what Fang Jing said just now, they didn't know what they were talking about, after all, it was only a few days in class, it was already difficult for them to know what they were talking about, not to mention that they had to know the root cause, so let's kill Fang Jing.

Qingque was very curious about the experiment that Fang Jing had just done, and after listening to what Fang Jing said, he understood the truth, and there was nothing else in his heart except for the reverence of Fang Jing, at this time, in his heart, there was no resentment when he came, but he hoped to listen to Fang Jing's lecture for a long time in the future.

PS: Today's five watches, one shift every two hours, tired Amu got it, the subscription is bleak, don't even think about rewarding, write slowly, thank you for the company and growth of book friends.

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