Although it is said that he will be outside and wander casually.

But Zhang Yang was still quite worried. He was hiding in the cave by himself, staring at each other, scratching his heart.

If it is not forced by the law of true fragrance——

Well, once the man speaks out, eight horses can't pull back.

After re-structuring himself mentally, Zhang Yang went straight to the deepest part of the cave. The so-called out of sight, out of mind, he wanted to retreat, so he really went to retreat.

"Ugh, it stinks!"

A few seconds later, Zhang Yang rushed out of the cave as if fleeing. After all, he is not a real person who holds his breath.

"Don't look at me, I'm going to find a place where I can really retreat!"

Zhang Yang left in a huff. He did what he said, and if he said he would not interfere, he would not interfere!

One side of this valley is full of stone walls and cliffs, so it shouldn't be difficult to find a cave, where he has to think about how to improve and optimize the mana structure.

Half an hour later, Zhang Yang walked back helplessly, because there was only such a cave in this valley, and it was such a high-quality cave. It was more than 50 meters deep, with winding paths leading to secluded places, but it was too smelly.

"Be cruel to you primitive people, no, be cruel to you Neanderthals!"

He slandered viciously in his heart, and Zhang Yang didn't look at Wu Yuan's inquiring eyes, don't get close to me, now I'm nothing.

After working for half a day, he cleaned up the inside of the cave. At this time, he felt that he had become a piece of stinky meat. Originally, it was okay to instruct other members of the Cada tribe, but Zhang Yang did what he said. I realize that everything depends on Wu Yuan himself, he will not help, nor interfere, let alone hold back.

During the period, Zhang Yang personally hunted and killed an ordinary beast, and he would not even share the food.

When he set up a small fire in the deepest part of the cave, the billowing smoke that had no place to rest reminded him of one thing.

"Come on, I can burn trees into charcoal! The flame generated by pure wood burning is not completely high-temperature plasma state. Even the outer flame that has the most contact with oxygen has a temperature of only five or six degrees." , but if it is replaced by charcoal, it can easily refine steel, with a maximum temperature of more than 1000 degrees!"

"Wait, let me think about it, what did you say in chemistry class? When charcoal burns, it seems that it is not a flame, but a kind of light, right, because the essence of flame is a combustible gas, including High-temperature steam, various small solid particles, contact with air to undergo an oxidation reaction, and then light and heat will appear, that is, it will become a plasma state—"

"I used the compressed soul force field to form a second closed circle, and then formed a curved force field. The flame absorbed by it is not as terrible and mysterious as ordinary people think. It is just a kind of gas that cannot be fully burned."

"So what I want to understand now is, can the light emitted by charcoal burning, that is, the heat emitted by it, be sucked into the second closed circuit instead of the flame? After all, heat can only be a process quantity, and it has nothing to do with the nature of the flame. Unlike the flame, the heat is invisible."

Zhang Yang fell into deep thought, and it took him a long time to smile,

"If you think about it like that, it's a dead end. I'm not a theory man. Just try it out and you'll know!"

Zhang Yang started making charcoal with great enthusiasm. Fortunately, even if he is a scumbag, he still knows how to make charcoal. He buried the burned wood directly with ashes to isolate the air, and what was left was almost Charcoal, of course, the quality is definitely not as good as professionally burned.

This busy, is a full two days.

During this period of time, Zhang Yang always insisted on his promise not to interfere with all of Wu Yuan's decisions, even Wu Yuan asked him to report but was driven away by him!

Of course, Wu Yuan only looked for him once, if he came a few more times, maybe Zhang Yang would break his promise.

In the past two days, Zhang Yang burned about 500 kilograms of charcoal. Let alone the quality, he combined what he had learned in the past and the bits and pieces of knowledge he could still remember in the process of burning charcoal. He really found many interesting things about the force field, which made him full of confidence in the next experiment.

On the third day, that is, the fourth day of the hero trial, before Zhang Yang started the experiment, Wu Yuan took 15 warriors from the Gada tribe to set off. What is Wu Yuan going to do?

At this moment, it is impossible to say that Zhang Yang is not worried or regretful. He is afraid that the news that he failed the hero test and was obliterated will come from the next moment. Oh, no, if he is obliterated, there will be news? Just burp, okay?

Turned around like ants on a hot pot for a few times, finally Zhang Yang yelled, let it go, he chose to believe in Wu Yuan, believed that he could do everything independently, believed that he would grow rapidly, believed He really is the hero of the village.

"What the hell is a hero's trial? This is clearly the village chief's bloody trial!"

With a long sigh, Zhang Yang finally went all out, got rid of distracting thoughts, collected his mind, and began to concentrate on building a simple clay stove.

He didn't ask for a sealed furnace that could make iron, but he just allowed the charcoal to fully burn and reduce heat loss.

After all, he was just experimenting, not making steel.

In other words, he should be the first person in history to study fireball magic so down-to-earth.

When the earthen stove was slightly dry and formed, Zhang Yang put the charcoal in and set it up, and finally ignited it. There was also a stone slab on top of the stove, and the blower—of course there was no blower, but he could use the soul force field to compress the air balls. , continuously fed into the burning earthen furnace, which worked very well.

So just for a moment, that is the heat wave.

Zhang Yang didn't dare to wait too long. His soul force field could control the flames purely because the temperature wasn't high enough. Now the temperature in this earthen stove must be around 600 to 700 degrees.

As soon as he gritted his teeth, Zhang Yang began to compress the soul force field. He didn't need any compressed air balls, and directly constructed a second closed circle, forming a curved force field, covering the clay furnace—boom!

With a loud bang, the clay stove shattered, and the dirt, rocks, and red charcoal were all sucked into the curved force field. In an instant, a soil ball appeared out of thin air in his hands.

Thanks to his quick reaction, he directly constructed the fourth closed circle and threw the soil ball out.

"boom!"

There was a loud noise, billowing smoke, and flying earth and rocks. This scene was so familiar.

I stood there for a long time,

Zhang Yang: MMP, is this a grenade?

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