"How is this possible?" Xu Chen shook his head when he heard this.

"Why not? Since aura and electricity can be interchangeable, why can't they be used universally?" asked Yang Ziyun.

"Of course not! The substitution between the two is only in the depiction of the runes! And although the runes I have carved are also effective, their essence is very different from the existing runes!"

"Besides, my current small generator originally relied on the power of the runes to provide a continuous and stable power source, and it was to consume spirit stones! To put it bluntly, it was to convert the spiritual energy in the spiritual stones into electrical energy! In the final analysis, it was still consuming spiritual energy resources, how could it be possible to solve the spiritual energy crisis?"

"That'...... Can't you change the method of generating electricity? Don't you also say that the rune is just a replacement for you, and this generator should have another power source, right?" Yang Ziyun still didn't give up and asked.

Xu Chen shook his head with a smile and said, "Yes, although it is a bit troublesome, it is indeed possible to create an internal combustion engine by relying on the power of the runes, and the large furnace I prepared will be able to be used at that time!"

"But the problem is that there is a fundamental difference between electricity and aura! As I said earlier, the process of conducting electricity in the circuit diagram cannot produce other substances, but the circulation of aura in the rune can produce other substances!"

"Let's put it this way! You can use the aura of various attributes to cultivate and cast spells, which is rooted in the characteristics of the aura itself that can be transformed into other powers! Or the aura of various attributes has the characteristic of being able to transform into corresponding attribute energy!"

"As for your ability to absorb and use aura of other attributes, it should be your advantage as a Thunder Linggen monk! At this point, I'm not a monk, so I don't know much!"

Hearing this, Yang Ziyun pondered for a moment, and then smiled: "I know this!"

"Although the alien spirit root and the heavenly spirit root are single-attribute spiritual roots, in fact, there is no monk who has only one spiritual root attribute at all!

"This is the root of the single spirit root cultivator's ability to use other attribute aura!"

"Oh, I see!" Xu Chen suddenly said after hearing this, and then said: "However, no matter what, this qiē is an ability unique to people with spiritual roots, and it cannot be repeated by other people or objects!"

"As for ordinary energy such as electricity, it can only be used as an energy source, but it cannot be relied on for a monk's cultivation!"

"That's ......" Yang Ziyun heard this, and her face was immediately full of disappointment.

Through the practice of January, Yang Ziyun has a deep understanding of the current situation of the lack of aura in the cultivation realm!

"Okay, don't mention this!" Xu Chen smiled and pulled Yang Ziyun's gaze back, pointed to the stove and said to Yang Ziyun: "Look! After the electricity is transmitted to the furnace, the metal rod wrapped around the coil will generate heat, and then the 'flame' rune on the outer furnace wall will be activated, and this heat will become larger, and at the same time, it will become more stable!"

"Then put the inner furnace in!"

While speaking, Xu Chen pulled a few joysticks on the table, without having to do it himself, and the small black pot on the wooden table was lifted by two slender "iron arms" one left and one right.

Immediately, the "iron arm" began to move slowly, just as the small black pot was placed in the induction cooker.

"After putting it away, the metal rod will heat up the inner furnace, which is the same as an ordinary refining furnace! It's just that my induction cooker is much better than theirs! I can control the power transmission of the metal rod through the guò switch, so as to control the furnace temperature at will and accurately, and I don't have to rely on the refiner's long-term feel at all!" Xu Chen said quite proudly.

"Then it's time to add the ingredients!"

As he spoke, Xu Chen pulled down an iron rod again, and another "iron arm" immediately threw a piece of ore from the wooden frame into the furnace.

"Once the lid is closed, all that's left is to wait!"

Yang Ziyun looked at Xu Chen's operation, and suddenly wondered: "I can understand the advantages of your furnace to control the temperature of the furnace at will, but why do you have to bother to divide it into two furnaces?

"You're on the point!" Xu Chen praised and then asked, "Do you remember what happened when we were in the Biancheng blacksmith shop?"

Yang Ziyun recalled for a moment and asked, "You mean that hollow iron pipe?"

"That's good!" Xu Chen nodded and said, "That was originally the most critical part of my secret weapon! Whether it was hardness or workmanship, it could fully meet my requirements! But I didn't expect it to have a fatal flaw!"

"You mean what's going on in the ruined city?"

Yang Ziyun suddenly remembered the scene that happened that night in the densely vegetated underground palace in the ruined city.

"That's right, that perfect hollow steel pipe can't withstand the burning of gunpowder!"

Xu Chen said with regret, and then came to Tiangongzong with all his might, just because of that failure, or discovery!

Of course, now it seems that the Tiangong Sect and his party have come to the right place!

Otherwise, there would not be a collision between these two advanced civilizations across the ages!

"That discovery made me understand that not a single substance in this cultivation realm can withstand the erosion of oxygen, let alone the strong oxidation reaction!"

"And combustion, in essence, is a luminous, exothermic oxidation reaction!"

Xu Chen said solemnly.

"You mean, you can't make something that meets your needs with the metal of the Cultivation Realm?" Yang Ziyun asked.

"Not bad!" Xu Chen nodded.

"Then what are you going to do?" Yang Ziyun continued.

"It's simple! Isn't it okay to use iron ore from the outside world to make steel!" Xu Chen smiled lightly.

"It turns out that the reason why I didn't make things out there is because the steelmaking level in the outside world is far from being able to meet my requirements! But the metal smelting level of the cultivation realm, although it can meet my requirements, the things I create are a defective product!"

"So you're thinking of using the technology here to refine the steel outside?" Yang Ziyun finally understood.

"Yes, it's just that there are still huge technical problems in this!" Xu Chen responded to Yang Ziyun's guess, but continued: "But all the materials in the cultivation realm can't withstand the combustion reaction of the outside world! If you directly throw the ore from the outside world into the cultivator's refining furnace, it won't take a moment for the refining furnace to be eroded by the oxidation reaction, after all, the ore from the outside world contains some oxygen atoms, and once it starts to be heated and smelted, it is difficult to guarantee that there will be no gaseous oxygen." Besides, the combustion of external substances is a kind of oxidation reaction no matter what kind of material! The materials of the cultivation realm cannot resist it at all!"

"So you're going to divide the furnace into two layers, separating heating from burning?" Yang Ziyun muttered softly.

Xu Chen was overjoyed and said with a smile: "You are really smart!"

Yang Ziyun immediately glanced at him, and reprimanded happily: "People are not stupid, okay!"

"Yes, yes, you're the smartest!" Xu Chen praised with a smile.

"You're right, the reason why I went to great lengths to divide the furnace into two layers, the inner and outer layers, is to separate the heating from the smelting!"

"Now this furnace still uses the materials of the cultivation realm, and it can only be used to smelt the materials of the cultivation realm! When I go out, I will use the steel from the outside world to build a furnace that can smelt the metals of the outside world!"

While speaking, Xu Chen opened the large cabinet under the wooden table, pointed to the rows of small black pots inside, and said with a smile: "Although this first steelmaking furnace will definitely consume countless such furnaces, but fortunately, I am fully prepared!"

"You...... Shouldn't you use all the 500 catties of thousand-year-old earth core iron on this?" Yang Ziyun asked dumbfounded.

"That's right! It's hard to get started!" Xu Chen said as a matter of course: "I have carved strong reinforcement runes on these stoves, and coated them with a layer of film with electricity, and slightly oxidized them beforehand. ”

"That's all, they are all finished products that have undergone a slight oxidation, and the rest of the waste products have already been returned to the furnace by me!"

Xu Chen still said worriedly: "But that's it, whether these furnaces can successfully build the first steelmaking furnace, to be honest, I still don't know the bottom in my heart!"

"But if it's not enough, then I have to make molten steel little by little, first cast a small steel furnace, and then use the trained small steel furnace to smelt the molten steel, and use the relay method to make a large steelmaking furnace!"

"You're really determined!" Yang Ziyun laughed bitterly.

"Yes! As long as the large-scale steel-making furnace is successfully manufactured, all the relevant weapons can be put into production, and they will be mass-produced! This, for me, means the lives of me and my brothers!" Xu Chen said solemnly.

Seeing that the furnace was almost smelted, Xu Chen immediately said excitedly: "Come, show you how I carved the runes!"

Use the slender "iron arm" again to lift the small black pot out, and pour the red juice in the pot into the mold that has been prepared for a long time.

Immediately, Xu Chen pressed another button, and another "iron arm" happened to move, and a column of water immediately erupted from the sharp mouth at the top.

The sound of "zizi" was accompanied by layers of white smoke.

"It depicts a rune of a water system spell, and after the aura is infused, it can automatically spray water for quenching, which is very convenient, right?" Xu Chen said with a grin.

Removing the template that had been cooled, Xu Chen began the real rune carving.

"Look at it!" Xu Chen said as he took down a metal plate from the side of the wooden frame.

Yang Ziyun's eyes were sharp, and she found that the metal plate was actually hollowed out, and the empty part on it was crooked, and it looked like it was in the shape of a rune!

"Can you see it?" Xu Chen said with a smile: "These are the rune component templates I prepared in advance, a total of hundreds of pieces, which just contain all the rune components I decomposed!"

"How do you use it?" Yang Ziyun had a faint guess, but she didn't dare to confirm it. R1058