Qian Xinyao had already prepared paper and pen and quickly recorded these.

Han Jiang said again: "Instead of studying this, it is better to study gunpowder to the extreme." The best formula of gunpowder, the best production process, as far as I observe my Han New Year's fireworks gunpowder, I think it can be more than doubled. The military use of gunpowder today is still in the stage of fire. The real value of gunpowder lies in ......"

Han Jiang stopped.

Qian Xinyao had already stood up, if it weren't for the screen, she would probably have walked in front of Han Jiang.

Han Jiang sighed: "Okay, tell you." The real value of gunpowder is not burning, but exploding. ”

Shi Ziyan stood up: "Please Lang Jun make it clear." ”

Han Jiang shook his head: "This thing is too dangerous. ”

Qian Xinyao sat down behind the screen, her tone was very slow but with a threat: "I heard that Lu Yuanbo's Mansion has the intention to be friendly with the Han family, my Qian family governs the family with literature, but Lu Yuanbo's Mansion is a military general, and the second girl of the Zhai family will definitely like this gunpowder outbreak." ”

That's a terrible statement.

What Qian Xinyao said was that Han Jiang was going to give this gift to the second girl of the Zhai family.

What a.

At this time, the old Taoist Shi Ziyan got up: "Brother Jiang'er sits down, and the poor road will go back when he goes." ”

Shi Ziyan flashed, Mama Wu thought about it, and also found an excuse to retreat outside, and the maidservants saw these two go out, so they ran outside.

When there were only Han Jiang and Qian Xinyao in the room, Qian Xinyao pushed open the screen and walked out: "Han Jiang, I feel uncomfortable when you treat me like this. ”

"Don't make a noise." Han Jiang sat at the tea table.

Qian Xinyao sat opposite Han Jiang with her skirt: "If you ask you about cement, you won't tell me, and you will only tell me half of the soap making method, and now you won't tell me about gunpowder." You want a medical book, you want a purple bamboo needle, I have a little hesitation. ”

Han Jiang bowed his head and was silent.

Qian Xinyao asked again: "What is zero?" ”

Han Jiang was able to answer this question: "Zero is a way of calculation, but there is none." Zero is a number between one and minus one. We have long had a decimal algorithm, and how to write ten is a combination of one and zero. ”

As soon as she said this, Qian Xinyao immediately understood: "It's empty!" ”

The earliest application of zero in China is indeed emptiness, but there is no concept of zero, and the smallest number is one. It's been a hundred years since we really started using zero.

Speaking of mathematics, Han Jiang has no pressure.

Positive, negative, natural, odd, even, relative......

Han Jiang talked for about half an hour, and Qian Xinyao asked very seriously while recording, these are indeed knowledge, which is different from the current arithmetic knowledge.

The knowledge of root numbers, equations, and plane geometry can be added and integrated according to what he has learned.

Mama Wu came in at this time: "Brother Jiang'er, the lord said that the banquet is about to start." ”

Han Jiang bowed down and returned the salute: "Thank you, Mama Wu." ”

Mama Wu retreated again.

Han Jiang still sat still and didn't move: "Ling'er, listen to me." My Han family is in big trouble, and the people in Ruzhou now have no food, no weapons, and the official warehouse is empty. Someone told me that the best way to solve this problem is to marry Lu Yuanbo's family, and Mrs. Lu Yuanbo is still from the Yu family. But. ”

But Qian Xinyao likes to listen to it.

is not Han Jiang's attitude towards herself, but she likes Han Jiang's mentality and ability to carry trouble hard.

Qian Xinyao asked, "What a but?" ”

Han Jiang smiled: "I don't like to be threatened, and I don't need anyone to negotiate conditions with me, although I can't solve this matter, it's definitely not Lu Yuanbo's Mansion." You have peace of mind. ”

After speaking, Han Jiang prepared to leave. Qian Xinyao stretched out her hand and pulled Han Jiang: "How did the gunpowder explode?" ”

Han Jiang replied: "This is more dangerous than nitrification. ”

Qian Xinyao said: "Mr. Shi has more than 100 skilled craftsmen, and ninety percent of my monthly money is invested in it all year round. ”

Han Jiang asked rhetorically: "What about the output." Investment research with only input but no output can only be your hobby. And research that pays off on investment makes sense. I can tell you about the advanced use of gunpowder, but does it make sense? Not only can it not create a little value, but if this thing spreads, there will be no criticism in Lin'an Mansion. ”

Qian Xinyao crossed her hands and twisted her head: "I don't care." ”

Han Jiang was very helpless, and stood aside and thought for a full five minutes: "In this way, you optimize the formula of gunpowder, and in three months at most, I will come up with the most practical value for you to know the explosion, listen to me, research something that can make money, and only if you have money can you invest in new research." ”

Qian Xinyao's eyes lit up: "Soap? ”

"Yes."

Qian Xinyao asked again: "According to what you said about glycerin, it is so dangerous, so what should be done with the glycerin produced by making soap?" ”

"Glycerin can be used to make fruit juices, fruit wines, and preserved fruits. You can arrange for people to try it, pay attention to the dosage, people will not be poisonous if they eat it, but rats will be poisoned if they eat too much. Also, I've heard that this thing is useful for textiles, so I don't know how to use it, but I've heard about it. ”

"Spinning!" Qian Xinyao couldn't think of it, but the Qian family had a weaving workshop.

As long as this thing is useful, it can be experimented with.

Qian Xinyao said: "I listened to your advice, soap can be exchanged for a lot of money, you tell me the method of mass production?" ”

Han Jiang sat down again: "First of all, I don't really understand, but I learned a little principle when I was studying, that is, turning sea salt into alkali, this alkali is actually a very useful thing, such as the dough is sour, adding a little edible alkali is useful, and the ash water of plants and trees is actually the most primitive alkaline water." ”

Han Jiang recorded some of the knowledge fragments of his high school knowledge incompletely, but Qian Xinyao did record them seriously.

Qian Xinyao asked again: "This year's salt is very expensive, the official salt is 100 wen per catty, and the northern salt is more than 200 wen." ”

Han Jiang shook his head: "I have checked, the yamen only gives the salt field 16 wen per catty, and in fact, the price of salt can be smashed to the cost of 5 wen per catty, you don't care about this, you shouldn't have heard about the salt." You can try to make soap from the caustic soda used in the silk mill first, which is definitely less expensive than plant ash. ”

"Yes, yes." Qian Xinyao recorded quickly.

At this time, Mama Wu came in again: "Brother Jiang'er, the lord has sent someone for the second time." ”

"Thank you, Mama Wu." Han Jiang couldn't wait any longer, got up and said again: "Tell me if you have a bad money, don't mess around, learning is gradual." ”

"Hmph." Qian Xinyao looked unhappy.

None of your own father, grandfather, or great-grandfather have taught themselves like this, Han Jiang, you dare to use such a tone.

But Qian Xinyao had nothing to refute.

After Han Jiang left, Shi Ziyan came in, picked up the ones recorded by Qian Xinyao and began to look through them. At the same time, he sighed: "The rumors in the market are right, Brother Jiang's arithmetic is unparalleled in the world." ”