The torches almost pressed against the black crystals, but they still didn't respond!

It was as if it were only scorching sand and gravel, and in the bright flames, the black crystals shone brightly.

"Can't burn?" Xu Chen lowered his head and muttered, "Is it the problem of the material itself or the environment?"

The gunpowder will be different, Xu Chen has long expected it, after all, Biancheng is not the outside world. However, whether it is the problem of the material itself or the difference in effect caused by the change of the environment is not something that can be concluded now.

"Come over and do me a favor!" Xu Chen raised his head and said to Yang Ziyun.

"Huh?"

Xu Chen was sitting on the edge of the couch at the moment, and the girl glanced at it, her face full of hesitation.

"Hurry up!" Xu Chen didn't understand the girl's thoughts at the moment, and called again.

"You ......" the girl lowered her head and muttered in a low voice, "It's not good...... We...... We're not married yet......"

"Huh?" The voice was too small for Xu Chen to hear clearly.

"I mean, at least we should be married, and then ...... ...... again," the girl blushed.

The corners of Xu Chen's mouth twitched a few times, and he said with a wry smile: "I'm asking you to bring the jade pendant and borrow it!"

"Ahh

In a hurry, he took off the jade pendant hanging around his neck and handed it to Xu Chen.

Xu Chen shook his head helplessly and said, "Sit down!

"Oh oh......" The girl walked over with a red face and sat next to Xu Chen, her heart pounding.

"Come closer!" Xu Chen glanced at the girl who looked nervous three feet away, and said with some amusement.

"Huh?" Yang Ziyun looked at Xu Chen like a frightened rabbit, her expression full of hesitation.

Xu Chen was helpless, leaned over and pulled him over.

"Sit down!"

After Xu Chen finished saying this, he stretched out his hands to the collar.

"You...... What are you going to do?" Yang Ziyun saw Xu Chen's action, her heart trembled, and she thought about it wildly.

He ...... He shouldn't have thought about it...... No, no, no...... But if he insists on it...... Then I'...... What should I do?"

In the moment when the girl's thoughts were flying, Xu Chen quickly took out his jade pendant. He took a hard breath on the tip of his nose, then waved his hand and threw it into a clay pot on the table, and quickly closed the lid.

Then, just when the feeling of suffocation was about to come, Xu Chen rushed towards the girl and grabbed the girl's hand......

In Yang Ziyun's hand, there was the jade pendant, and when Xu Chen's hand touched the jade pendant, a coolness instantly spread throughout the body.

"What are you doing?"

When Xu Chen pounced just now, Yang Ziyun felt that she was also suffocated, her body stiffened, and she didn't react at all, as if she was waiting for her next fate...... But after waiting for a long time, he saw that Xu Chen was just holding her hand and did not make any further moves, so he asked suspiciously.

Xu Chen was staring at the clay pot, silently calculating the time in his heart, and when he heard Yang Ziyun's inquiry, he replied: "Collect oxygen!"

"Oh......" For some reason, the girl's heart was relieved and at the same time, she was faintly lost.

Xu Chen, who was fully engaged in the experiment, didn't notice the girl's abnormality, and after waiting for a while, Xu Chen said, "Come closer, stick the jade pendant on my back!"

The next step, one hand is inconvenient, Xu Chen had to think of a way, these days, the effect of the jade pendant has also been investigated, as long as the jade pendant can touch the body, it will follow the oxygen supply.

Xu Chen carefully poured out the jade pendant, and closed the lid quickly with both hands. Later, he took some black crystals and poured them into the clay pot. I didn't dare to pour more, just a little.

Immediately afterwards, Xu Chen quickly threw a small wooden stick burning into the clay pot.

Immediately, he listened intently......

"Wouldn't it? Why hasn't there been any response?"

Xu Chen, who waited for a long time and didn't hear the "squeak" sound, had to lift the lid.

I saw that the black crystals in the clay pot still did not react at all, and the flame on the small wooden stick was extinguished.

"It's not oxygen, it's because the materials themselves are different from the outside world?"

The three elements of combustion are combustibles, oxygen, and the temperature at which the ignition point can be reached.

This is something that Xu Chen already knew when he was in middle school, and now there is a problem, which is nothing more than in these three aspects.

In this world of cultivators, there is no oxygen, but there is also a flame, and obviously this flame is different from the outside world. When he was fighting against Senior Brother Ma, the ultimate move released by Senior Brother Ma before he died, the flames only existed for a moment, including the flame sigil seal after that. However, although the open flame was gone, the temperature was there, whether it was the large number of teenagers who were burned by the high temperature that day, or the big tree on the top of the mountain that was turned to ashes by flames, all of which showed that the flame also had high temperatures.

In this case, the problem can only arise with "oxygen" and "combustibles".

The gunpowder from the outside world is obviously combustible, but the three materials that Xu Chen collected here may not also be combustibles after mixing, or they may not meet the definition of combustibles from the outside world.

Charcoal, or something similar to charcoal, Xu Chen didn't have a hard time finding it, and there were plenty of these things on the stalls selling food on the street. As for sulfur being the product of volcanic eruptions, it is rare in Biancheng, but Xu Chen heard that cultivators will use earth fire on a large scale whether they are practicing pills or refining weapons, and even a few famous big workshops in Biancheng also use earth fire. The so-called earth fire is nothing more than magma that is active in the deep layers of the earth's crust, and there is definitely a lot of sulfur to be found at the edge of such a place. After asking several companies and promising a lot of money, Xu Chen finally got these sulfur-like things today. After all, this kind of thing that is very important to Xu Chen is just a worthless waste stone in their eyes, and if they can exchange this thing for dozens of taels of gold, the guy in the workshop can't be happier in his heart!

However, saltpeter is really hard to find, in desperation, Xu Chen had to return to his old business, using feces to ferment to make nitrate, these days, digging several dung pits at night, it was not easy to collect such a small packet.

Everything is all together, and the appearance doesn't look different, but in a completely different environment, it would be funny to say that there is no difference!

"Combustion is a strong oxidizing chemical reaction that emits light and exothermic, and explosion is a violent combustion of combustibles in a confined space......"

Xu Chen kept muttering, suddenly knocked his head again, and sighed: "Damn! I don't remember the equation of gunpowder burning at all!"

"If you can remember, you will be able to know that those atoms are moving!" Xu Chen felt sorry for himself, and suddenly smiled bitterly: "Even if you know, what do you ask me to use to verify what atoms are contained in these things?"

"There's also the 'oxygen' part...... In the end, did the method just now succeed in collecting oxygen? This jade pendant seems to produce oxygen as long as it is attached to the human body, but is this oxygen directly produced in the air around the body, and finally inhaled by the nose? Or is it directly sent into one's own body to supply oxygen to the organs? In addition, it is also unclear whether it is only when oneself is trapped in an oxygen-deficient environment that it will actively produce oxygen!"

"Ahhh

It is undoubtedly much easier to confirm whether oxygen is produced than to check the composition of the three materials.

Finding a poultry that had just been bought from the street and looked like a chicken, Xu Chen directly hung the jade pendant on the chicken's neck this time, and then ...... Still no response!

"Sure enough, if you leave the body, this jade pendant will not produce oxygen!"

The people of this world can't withstand the poisoning of oxygen, and obviously the poultry is even more impossible, since the chicken in front of him is unscathed, it can only mean that this jade pendant did not continue to produce oxygen when it was hung on the chicken's neck.

"Do you have to keep it in your hand?"

Xu Chen suddenly thought that he had inhaled several times in succession, and he had put the jade pendant in his hand, and then approached and inhaled again, and at that time, he obviously felt that his body was relaxed for a while, and it was indeed a condition of inhaling oxygen.

Thinking about it, Xu Chen felt unreasonable: "If oxygen is directly generated around the body, wouldn't the locals who are closer to him have already been poisoned?"

"No!

While talking to himself, Xu Chen moved again, changed to a small clay pot, buckled directly on the palm of his hand, and held the jade pendant in the palm of his hand.

After waiting for a while again, Xu Chen quickly took off the crockpot, and with the same steps, the small fire stick was thrown in again, and after waiting for a while, there was still no sound......

It seems that the oxygen provided by this jade pendant is directly absorbed by the organs through the body, and it feels like the body is relaxed after breathing, but in fact, it is just the organs that directly absorb the oxygen......

"What's wrong with you?"

Xu Chen has been busy, Yang Ziyun looked at his focused expression, and couldn't bear to disturb him, until now, Xu Chen showed an obviously dejected look, and Yang Ziyun couldn't help but ask.

"Oxygen can't be made!" Xu Chen sighed.

"What do you want oxygen for, aren't we already able to breathe normally?" asked the girl.

"It's not for breathing, it's for making a weapon, you can't succeed without oxygen!" Xu Chen replied.

"What weapon?" the girl asked.

Xu Chen looked at her and replied directly: "A thing called Hand Lei!"

"Hand Lei?" Yang Ziyun had never heard of, and asked again, "Is this thing important?"

"That's right! This is probably the biggest hole card in my hand!" Xu Chen remembered that when he was in the antwolf nest, the two hands that were obviously much better than the outside world were much better, and his heart was immediately hot, but when he thought about the problems he encountered now, he could only sigh helplessly.

"Hey, why can those two hands and thunder explode here?" Xu Chen suddenly remembered a key question. R1058