Daming: Old Zhu, we agreed not to rush!

Chapter 224 Ruixue heralds a prosperous year, melting and heat conduction!
"Master Su, did you succeed?"

Zhu Biao trotted over and asked excitedly.

Su Jing nodded and said: "Yes, it succeeded."

The strength of this high-carbon steel is much stronger than that of normal cast iron.

Zhu Biao took the steel pipe from Su Jing's hand, he could see the explosion just now very clearly.

The previous test firing of the firecracker was almost equivalent to exploding the chamber.

But now this steel pipe has not changed much, obviously the thickness is about the same.

"Master Su, how did you do it?"

Zhu Biao asked curiously.

Su Jing picked up a handful of black graphite clay and said, "It's very simple, this is it."

"Ink mud?"

Zhu Biao was puzzled. Although he knew that Su Jing was looking for graphite ore to refine higher-strength iron, he still didn't know the exact reason.

Su Jing said with a smile: "That's right, the main component of graphite is carbon. During the ironmaking process, adding carbon can increase its strength."

"However, the specific ratio needs to be carefully tested as a teacher."

Su Jing didn't stop there. Although the explosion experiment just now was very successful, there is still a problem with the steel pipe.

High carbon steel has high strength, but its shock resistance is slightly worse.

When the firearm is in use, the explosion will produce violent vibrations.

So, this is just the beginning.

"Student understands, then Master Su will stay in Laizhou Mansion for a while."

Zhu Biao said.

Su Jing nodded and said: "That's right, judging from the situation, it's probably impossible to make it back this year."

Heavy snow has begun to fall, and the temperature keeps dropping.

At this time, it is barely feasible to hurry back. In a few days, I am afraid that the horses will not be able to walk.

So Su Jing's plan is to simply spend the winter in this Laizhou mansion.

Wait until next spring, when the weather gets warmer, and then go back.

Anyway, returning to Lishui County is also a Chinese New Year, so there is no need to take risks.

In her previous life, Su Jing spent the winter in Shandong, so it was always cold.

If he drove back in a carriage, he might freeze to death on the way.

If a gentleman does not stand under a dangerous wall, he will come back next year at worst.

Zhu Biao was silent for a while, Su Jing glanced at Zhu Biao and said, "Why, homesick?"

Zhu Biao shook his head and said: "No, being able to be with Master Su is the same as celebrating the New Year wherever you are."

Su Jing smiled and said: "When next spring begins, you should stay at home for a while."

Zhu Biao has been following him for quite a long time.

However, upon hearing Su Jing's words, Zhu Biao's face suddenly changed.

"Master Su, are you not teaching the students?"

Zhu Biao asked very nervously.

"Ok?"

Su Jing looked at Zhu Biao in surprise and said, "Niu Yi, what are you thinking, there are still many things I can teach you as a teacher."

"Not much to say, another three years of study is not too much."

The content of the nine-year compulsory education alone, Su Jing streamlined the teaching, and it took almost three years.

Zhu Biao's talent is not as exaggerated as Zhu Huan, but it is not bad.

Su Jing didn't want to end her teaching in half a year.

This is to cultivate the scientific buds of Ming Dynasty, and it is a very important responsibility.

"Mr. Su is too modest. Students will definitely not be able to finish their studies in three years."

A look of joy appeared on Zhu Biao's face.

"Okay, you have been here for a few days, and you haven't written a letter to your family. Hurry up and write a letter to report that you are safe. In a few years, I am afraid that the letter will not be spread."

Su Jing touched Zhu Biao's head and said.

It doesn't matter that Su Jing is alone.

But Zhu Biao can't go home for the New Year now, so he still needs to report his safety.

"Well, Master Su, the students are going to write now."

Zhu Biao nodded immediately, turned around and went back to the house to start writing letters.

Zhu Biao has recorded everything about Qingzhou Mansion, which is more detailed than Jia Shaozu's.

Zhu Biao naturally wanted to write all of them, as well as the progress and success of Su Jing's experiment with the new steelmaking method.

And the soap, Zhu Biao wrote down the production method and usage, because the production is very simple, so I didn't bring the real thing.

The most important thing is the content of materialist dialectics that Zhu Biao has at hand at the moment.

These days, Su Jing is making steel all day long, while Zhu Biao is thinking about materialist dialectics.

For him, this thing is a bit too esoteric.

No, it should be said that in the background of this feudal dynasty, these things are too advanced.

Su Jing himself instilled his own understanding into Zhu Biao with a half-knowledge.

Already diluted once.

Zhu Biao's self-understanding was diluted again.

He hesitated for a while, and decided not to write these contents into the letter for the time being.

After all, he didn't even know a thing or two about these things himself.

Zhu Biao wrote this letter for an hour.

As for sending the letter, Zhu Yuanzhang knew Su Jing's destination, and someone from Laizhou Prefecture had already responded.

At the moment, among the garrison in Laizhou Prefecture, Mu Ying has been teaching Yuanyang formation for several days.

As the adopted son of Zhu Yuanzhang, Mu Ying, who has been honed in the army, is also well known by many soldiers.

"The usage of this wolf constitution should not be fought alone. The formation is very important and must not be messed up."

Mu Ying holds the wolf constitution in her hand, arranges the formation, and demonstrates and explains to the surrounding sergeants.

The sergeants also studied it very seriously, because they knew that this was to fight against Japanese pirates.

If you put on a show, you may pay the price of your life next year.

Even if it was freezing cold, no one complained.

The army in the early days of the founding of the Ming Dynasty was quite good in every aspect.

The snow is falling, and winter is finally here.

In the small courtyard, Su Jing also rarely made steel.

Because he has already smelted steels with various carbon contents, and he has all the data.

Here, he did not intend to directly make firecrackers.

The main reason is that I will go back as soon as the spring of next year, so there is no need to build so many equipment.

Moreover, the yard I rented here has been tested and exploded constantly, and has been inspected several times by the officers and soldiers.

That is to say, it is almost Chinese New Year now, and there are a lot of firecrackers. Although there is a lot of movement on Su Jing's side, there is no danger.

"It's freezing cold, it's really cold!"

Su Jing put on the cloak given to him by Empress Ma, which was actually the old cloak Zhu Yuanzhang used before.

Although it looks like an old cloak, Empress Ma has carefully mended it, and the cotton inside is also stuffed with new ones, which has a good cold-proof effect.

Wrapped in a cloak, it obviously didn't feel so cold.

Zhu Biao also put on clothes to keep out the cold, and accompanied Su Jing to the stove at the door.

"Auspicious snow heralds a prosperous year, which is a good sign."

Zhu Biao looked at the heavy snow, his face was full of joy.

Zhu Biao is happy when the people are good.

Su Jing said with a smile: "Everyone knows that auspicious snows herald a good year, so Niu Yi, do you know why there will be a good year after the auspicious snow?"

For the common people, Ruixue and Fengnian are two related phenomena.

After summing up, I got the proverb that auspicious snow heralds a good year.

But the deep connection among them is not so clear to the common people.

Zhu Biao thought for a while and said: "Because the heavy snow freezes the diseases and insects to death, and at the same time snow is also water. After the spring melts, it is equivalent to irrigating the soil."

I have also studied with Su Jing for a long time, and Zhu Biao's answer is more inclined to scientific explanation.

"What you said is reasonable, but Daxue has another crucial role, which you didn't mention."

Su Jing said lightly.

The vital role of heavy snow?
This made Zhu Biao puzzled, isn't what he said important?
"The students don't understand, so please ask Master Su for guidance."

Zhu Biao asked modestly.

Su Jing said with a smile: "It's actually very simple, because heavy snow can keep warm. In terms of planting, soil temperature is very important. If frozen soil is formed, it will be difficult for crops to grow."

Snow to keep warm?

Hearing Su Jing's words, Zhu Biao felt very surprised.

Snow is something only in winter, and it is a concept that is bound together with cold.

How can snow keep you warm?

"Master Su, the students don't understand."

Zhu Biao shook his head and said.

Zhu Biao didn't know about this aspect of physics, and Su Jing didn't mention it much.

"Haha, I don't understand, let me ask you, why do you think cotton clothes can keep you warm?"

Su Jing asked with a smile.

Zhu Biao replied: "Because the cotton coat is very thick, the cold is kept out of the coat."

Very intuitive answer.

Su Jing said: "It's not accurate to block the cold. In fact, remember the three-state change of water I told you before."

That's what Su Jing said when he first introduced Zhu Biao to the door of physical folding fans.

"Students of course remember that water has three states. The common one is liquid, which is the water I usually drink. When the temperature drops below zero, it will freeze into ice. Ice is the solid state of water. If precipitation is heated to boiling, water evaporates, forming white water vapor."

Zhu Biao immediately repeated what Su Jing said at that time.

He really took down all the cognitions taught by Su Jing seriously.

Su Jing nodded and said: "Very good, what is the essence of the process of turning ice into water?"

Zhu Biao immediately replied: "Melting, absorbing heat and melting."

Su Jing smiled and said: "That's right, absorbing heat, ice turning into water is absorbing heat, absorbing heat is absorbing heat, and turning water into ice is freezing, and freezing is releasing heat."

"It goes without saying that there is a difference in temperature between ice and water. Whether it's cold or not is actually the transfer of heat. Do you understand?"

Su Jing paused for a moment, giving Zhu Biao some time to think.

He still remembered that when watching a certain variety show in his previous life, a certain artist couldn't understand how to keep warm.

I actually thought that wrapping a popsicle in a quilt would speed up the melting.

That is actually a lack of understanding of the nature of cold and heat.

Fortunately, Zhu Biao, as the prince of the Ming Dynasty, has no problems with his mind.

Soon Zhu Biao nodded and said: "Master Su, the students understand that the reason why the cotton-padded clothes can keep warm is because the cotton-padded clothes block the transfer of our own heat to the outside, and our body temperature is kept inside the cotton-padded clothes, so we naturally feel warm. "

Children can be taught!
Su Jing looked at Zhu Biao, nodded slightly and said: "Very good. After understanding this layer, let's look at it again. As a medium, cotton clothes can well block the transmission of heat, so cotton clothes are used to keep out the cold in winter."

"However, Niu Yi, have you noticed that cotton-padded clothes are always new and warmest, and so are quilts. When winter is approaching, craftsmen who play cotton start to walk around the streets, and the common people take out their quilts and put them on The cotton in the quilt is bounced again, and the quilt made by this way is more warm."

Zhu Biao really didn't expect this little phenomenon in life for a while.

Because he is the prince, and the prince was the eldest son before, and his family conditions have been very good since he can remember.

This kind of life-like thing is not so common.

But not at all.

At least the matter of picking cotton will be done uniformly in winter in the palace.

Zhu Yuanzhang's life is not extravagant.

"Indeed, it's even warmer to make cotton clothes and quilts from the cotton that has been plucked."

Zhu Biao nodded, but there was more doubt in his expression: "Why?"

If cotton can keep warm, the elastic is only a physical change and does not add anything, how can it make the warming effect better?

Su Jing looked at Zhu Biao who was puzzled, and said, "Come on, Niu Yi, raise your hands, put your palms together, and then approach slowly, remember, don't put them together."

Zhu Biao immediately followed Su Jing's words and put his hands together, but there was still a certain distance between them.

"I don't feel anything."

Su Jing asked.

Zhu Biao replied: "Hot! Teacher Su, the students can feel the heat in the middle of their hands."

"That's right, the human body is like this. It constantly emits heat, and the air can also be used as a medium for heat transmission."

Su Jing said: "Fluffing cotton is actually making the cotton fluffy. There will be a lot of air holes in the fluffy cotton, and there will be more air in it."

"Among our common substances, the thermal conductivity of air, a medium, is actually relatively poor, that is, the ability to transfer heat is weak."

"So, the more fluffy the cotton, the better the warmth of the quilt you make, and it's all because of the air."

"Then the warming effect of heavy snow is also the same. Snow layers are piled up together, very fluffy, and there is a lot of air, which ensures that the heat will not be lost."

"This is the secret of heavy snow insulation, but if the snow is compacted, the insulation effect will be much worse."

Su Jing casually grabbed a pile of snow, squeezed it hard, and it immediately turned into a small snow ball.

Zhu Biao also squatted down, held up the snow with both hands, and observed it carefully.

Sure enough, as Su Jing said, the snow is fluffy.

It was just a snowfall, and Zhu Biao was shocked by the knowledge Su Jing narrated.

"That's not right, Master Su, according to what you said, the heavy snow keeps warm and the bugs in the soil should also be protected? I said before that the bugs were frozen to death, and you didn't say it was wrong!"

Zhu Biao was puzzled again, he was not a dull student who could only listen to lectures and memorize.

Su Jing smiled and said: "Isn't this very simple? In spring, the snow will melt, absorb heat, and the temperature of the soil will drop rapidly, and the bugs in the soil will freeze to death. As the saying goes, it is cold before frost, and the snow will This is the reason behind the cold."

It turned out to be back to the melting point of knowledge.

Zhu Biao looked at Su Jing with shock and admiration in his eyes.

He bowed towards Su Jing and said, "Students are taught."

Su Jing waved his hand and said: "What are you doing with these nonsense, have you really learned it, not necessarily."

"Well, here's a question for you, use the principle of air to keep warm, and burn a batch of strong and warm bricks."

(End of this chapter)