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Huh!" After the knife was carved, Wan Changchun couldn't help but exclaim softly. Su Yichen, who was standing beside him, was also stunned, because he clearly saw that the tip of the knife in Wan Changchun's hand did not leave any scratches on the surface of the building.

Hardness is a professional term in physics. The ability of a material to partially resist the hard object pressing into its surface is called hardness. The local resistance of solids to invasion of external objects is an indicator of softness and hardness of various materials. According to different test methods, hardness also has different standards. According to the classification of hardness, it can be divided into eight categories: Rockwell hardness, Brinell hardness, Vickers hardness, Richter hardness, Shore hardness, Papillar hardness, Nubs hardness, and Webster hardness. Generally used, it is basically selected. Among them, Rockwell hardness, Brinell hardness, and Vickers hardness are selected.

In nature, diamond is the most harder substance. According to the standard of the Mohs hardness meter that appeared in 1822, diamond is the tenth grade. Among single metals, chromium has the largest hardness, with a grade between 8.5 and 9, second only to diamond.

Of course, in some laboratories, harder alloy materials have been successfully synthesized, and the hardness of this alloy material has almost reached level ten or even higher. For example, the compound of tungsten and carbon elements - tungsten carbide is harder than tungsten steel, and can be compared with the hardest diamond in nature.

The knife in Wan Changchun's hand is inconspicuous, but its material is tungsten steel, and its hardness can reach Vickers 10K. Moreover, if you scratch hard on the surface of hard objects, even if the other party is the hardest diamond, the material of this knife can still carve scratches. What surprised Wan Changchun and Su Yichen that they did not leave any marks on the surface of the building, which was simply incredible.

"Teacher Wan, I'll do it!" Su Yichen said quickly. Wan Changchun handed the knife to Su Yichen. Compared with Su Yichen, he is older and it is possible that he lacks strength. Maybe he can do it if he changes someone.

Taking the knife, Su Yichen held the handle of the knife in the most appropriate position, pressed the tip of the knife first against the outer wall, then took a deep breath, and slashed the strength on his wrist. When he felt the friction from the blade, Su Yichen felt a little happy, and then put down the knife and looked at the outer wall carefully, but after looking at it, he was stunned again.

"How is this... possible!"

Su Yichen couldn't believe his eyes. The outer wall of the building surface was still the same as before, with no scratches on it. You must know that even if his strength just now was replaced with a diamond, it could make deep marks on its surface.

Wan Changchun frowned, but was surprised and surprised. He discovered unexpectedly in the desert that although he didn't know what kind of metal or alloy it came from, or where the building came from and what its function was, none of these matters. What mattered was that they discovered an amazing fact that its hardness must have exceeded the tenth level. As for how much it reached, it could not be calculated at all under the current circumstances.

The inability to leave traces on the surface also means that they cannot take a small part of the sample from the whole. Su Yichen looked at Wan Changchun with inquiring eyes. After thinking about it, Wan Changchun took out a match, lit a strip of cloth, and then raised it up carefully, trying to use the outer flame to touch the surface.

The cloth strip was not big, so it couldn't burn for much time. It was almost burned out in a few minutes. Wan Changchun threw away the cloth strip that had not yet been extinguished, and then quickly touched the part of the barbecue with his fingers. However, after a short touch, his eyebrows suddenly raised, and then he pressed his entire palm up.

When Wan Changchun made this move, Su Yichen almost shouted out, but he held back the words when he spoke, because he knew that Wan Changchun would never do this move recklessly.

Fire is something that people often come into contact with in their daily lives. It can even be said that human evolution cannot be separated from fire. The legend of drilling wood to make fire has been passed down for thousands of years. Ancient humans evolved from apes to primitive people, and then slowly became real humans. Fire has always accompanied the development of human society.

The luminescence and heat generation are generated in the combustion substance. The release of this energy is fire. During the combustion process, the flame is divided into three parts: external flame, internal flame and flame center. Among these three parts, the temperature of the outer flame is the highest. The temperature of the outer flame of the alcohol lamp commonly used in the laboratory can reach about 600 degrees. The temperature of the media ball furnace used in the ordinary household can reach about 800 degrees. The temperature of the hydrogen and oxygen flame used in the industry can reach about 2500 degrees to 3000 degrees. Although the temperature of Wan Changchun's ignition cloth strip just now is not as good as these, even the temperature of the alcohol lamp cannot reach at least 600 degrees, but it can be at least about 200 degrees. Such high temperatures are barbecued on the metal surface. The metal characteristics will form a thermal conductivity phenomenon. The temperature should be deducted from the loss part.

But now, Wan Changchun put his entire palm on the part being grilled, but there was no hot reaction. This violated the characteristics of metal, making Su Yichen stunned.

"Teacher Wan, is it..."

Wan Changchun nodded solemnly, and he moved his palm away and signaled Su Yichen to try it too. Su Yichen raised his hand and pressed it on as Wan Changchun. When his palm touched the surface, his heart was shocked even more than before.

"This...this..." Su Yichen raised his hand incredibly and pressed it again, and then touched the position slightly farther from the barbecue area, but the temperature from the palm of his hand was almost the same. Not to mention getting hot, he couldn't even feel the sign of heat. No matter which part it was, at least there was no difference.

For a moment, Su Yichen thought he was dreaming, and this situation that completely violated physical phenomena made him extremely surprised. However, the facts were in front of him and he could not believe it.

"Lao Wan, Xiao Su, how about it? Can you leave?" Hu Zhijun stood not far away and saw Wan Changchun and Su Yichen surrounding the building, and now they were igniting, burning and grilling, and touching it strangely with their hands. The more they looked, the more they became more and more puzzled. He didn't understand what it was to study about this thing, isn't it just the ruins in the desert? Although it was strange and huge, so what? If it was really worth studying, at least it wouldn't be too late to wait until they arrived at the supply station to contact the base before doing it. At worst, send more people and equipment from the base and remove the whole thing and move it back. Why bother to waste time here?

Seeing that the half hour had been agreed upon, Hu Zhijun couldn't help asking, but Wan Changchun and the others ignored Hu Zhijun at all, and were still knocking on the surface of the building and didn't know what to do. They frowned slightly. Hu Zhijun was about to urge him a few times, but after thinking about it, he would just forget it. No matter what, Wan Changchun and Su Yichen are experts and scientists at the base. According to the head of the base, they should respect these experts and give them the greatest convenience and assistance. Since they want to study for a while, they should give them some time.

Thinking of this, Hu Zhijun planned to prepare for his departure with Gudamai first, but when he turned around and was about to call Gudamai, he saw that Gudamai was pale and looked at the building with his eyes straight, with a look of horror in his eyes, and even his body was trembling slightly, as if he had seen something terrible.

"Gudamai!Gudamai!" Seeing Gudamai's expression abnormal, Hu Zhijun was a little surprised. He walked towards Gudamai and shouted a few times.

"Plane...the platoon leader..." Gudamai's straight eyes slowly turned, and he stammered and said to Hu Zhijun: "I...I remembered...I finally remembered..."

"I remembered it? What did you remember?" Hu Zhijun asked for some inexplicable reason.

"It! I remember what it is!" Gudamai raised his hand and pointed to the strange building in front of him, and said in a trembling voice: "This is Alivasti's palace! The legendary Alivasti! I am so stupid. I should have remembered it for a long time. Platoon leader, let's go! Let's leave here quickly! If Alivasti wakes up, we can't run away!"
Chapter completed!