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Hey! After the knife was engraved, Wan Changchun couldn't help but snort softly, and Su Yichen, who was standing on the side, 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 resist the local pressure of hard objects into its surface is called hardness, and the local resistance of a solid to the invasion of external objects is an index that compares the softness and hardness of various materials. According to different test methods, hardness also has different standards, according to the classification of hardness can be divided into: Rockwell hardness, Brinell hardness, Vickers hardness, Leeb hardness, shore hardness, Barcol hardness, Knoop hardness, Wechsler hardness these eight categories, commonly used, basically selected among the three categories of Rockwell hardness, Brinell hardness, and Vickers hardness.

The hardest substance in nature is diamond, which is the tenth grade according to the Morse hardness tester that appeared in 1822. Among the monometals, chromium is the hardest, with a grade between 8.5 and 9, second only to diamond.

Of course, in some real chambers, harder alloy materials have been successfully synthesized, and the hardness of this alloy material has reached almost grade 10 or even higher, such as tungsten carbide, a compound of tungsten and carbon elements, which is harder than tungsten steel, comparable to the hardest diamond in nature.

The knife in Wan Changchun's hand is not inconspicuous, but its material is tungsten steel, and the hardness can reach 10K on the Vickers scale. What's more, if you scratch the surface of a hard object, even if the other party is the hardest diamond, you can carve scratches with the material of this knife. To Wan Changchun's and Su Yichen's surprise, they didn't leave any marks on the surface of the building, which was incredible.

"Teacher Wan, I'm coming!" Su Yichen hurriedly said, Wan Changchun handed the knife to Su Yichen, compared to Su Yichen, he is older after all, and it is possible that he lacks strength, maybe it is okay to change someone.

Taking the knife, Su Yichen held the handle of the knife with the most suitable posture, put the tip of the knife against the outer wall first, then took a deep breath, and used all his strength to slash down on his wrist, when he felt the friction feeling from the blade, Su Yichen was slightly happy in his heart, and then put down the knife and looked at the outer wall carefully, but after looking at it, he was instantly dumbfounded.

"This ...... How can it be! ”

Su Yichen couldn't believe his eyes, the outer wall of the surface of the building was still the same, and there was not the slightest scratch on it. You must know that even if he changes to a diamond, he can make deep marks on its surface.

Wan Changchun frowned deeply, but there was surprise and surprise, the unexpected discovery in the desert, although he didn't know what kind of metal or alloy this was, or even where this building came from, and what it did, but these were not important, the important thing was that they found an amazing fact, that is, its hardness must have exceeded the tenth grade, as for how much, it is impossible to estimate it under the current situation.

The inability to leave marks on the surface also meant that they simply could not take a small part of the sample as a whole. Su Yichen looked at Wan Changchun with an inquiring gaze, Wan Changchun thought about it and then took out a match, lit a strip of cloth, and then carefully held it high, trying to touch the surface with the outer flame.

The strip of cloth is not large, so it doesn't take much time to burn, and it almost burns out after a few minutes. Wan Changchun threw away the strip of cloth that had not been completely extinguished, and then quickly touched the barbecue part just now with his fingers, but after a short touch, his eyebrows suddenly raised, and then he pressed the entire palm up.

When Wan Changchun made this action, Su Yichen almost shouted out, but when the words came to his mouth, he held back again, because he knew that Wan Changchun would never do this action recklessly.

Fire, which is something that people often come into contact with in their daily lives, can even be said that the evolution of human beings is inseparable 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, and fire has always accompanied the development of human society.

The release of light and heat in the burning substance is fire. In the combustion process, the flame is divided into three parts: the outer flame, the inner flame and the flame center, and among these three parts, the temperature of the outer flame is the highest. The temperature of the external flame of the alcohol lamp commonly used in the real room can reach about 600 degrees, the temperature of the furnace fire, that is, the ordinary household matchmaking furnace, can reach about 800 degrees, and the temperature of the hydrogen and oxygen flame used in industry is even higher, which can reach about 2500 degrees to 3000 degrees. Although the temperature of Wan Changchun's burning of the cloth strip just now is not as good as these, even the temperature of the alcohol lamp of 600 degrees can not be reached, but at least about 200 degrees, such a high temperature barbecue on the metal surface, with the characteristics of the metal will form a thermal conduction phenomenon, and its temperature should be about 180 degrees after deducting the loss part.

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

"Teacher Wan, is it ......?"

Wan Changchun nodded solemnly, he removed his palm, and motioned for Su Yichen to try it too. Su Yichen raised his hand and pressed it like Wan Changchun, and when his palm touched the surface, the shock in his heart was even worse than just now.

"This ...... This....... Su Yichen raised his hand incredulously and pressed it again, and then touched the position a little farther away from the barbecue part, but the temperature from the palm of his hand was almost the same, not to mention hot, and he couldn't even feel the slightest sign of fever, no matter which part it was, at least it didn't feel any difference.

For a moment, Su Yichen almost thought that he was dreaming, and this situation that completely violated the physical phenomenon made him feel extremely surprised. But the facts are in front of him, and he can't be disbelieved.

"Lao Wan, Xiao Su, how is it, can I go?" Hu Zhijun stood not far away, and saw Wan Changchun and Su Yichen circling around the building and comparing and drawing, and now they were lighting a fire, burning and roasting, and strangely touching it back and forth with their hands, the more they looked at it, the more they wondered. He didn't understand what there was to study about this thing, wasn't it just a ruin in the desert? It's weird, it's bigger, but so what? If it's really worth studying, at least it's not too late to wait until they get to the supply depot to contact the base. It's a big deal, when the time comes, send more people and equipment from the base, and dismantle this whole thing and move it back, so why waste time here?

Seeing that the agreed half-hour time was almost up, Hu Zhijun couldn't help but ask, but Wan Changchun and the others ignored Hu Zhijun at all, still banging on the surface of the building and not knowing what was being done. Frowning slightly, Hu Zhijun just wanted to urge a few times, but after thinking about it, forget it, anyway, Wan Changchun and Su Yichen are experts and scientists in the base, according to what the head of the base said, these experts should be respected, and they should be given the greatest convenience and assistance, since they want to study for a while, it is to give them some more time.

Thinking of this, Hu Zhijun planned to prepare for departure at any time with Gudamai first, but when he just turned around and was about to call Gudama, he saw Gudamai looking at the building with a pale face and straight eyes, his eyes were full of horror, and even his body was trembling slightly, as if he had seen something terrible.

"Gudamai! Kudamai! Seeing that Gudama's expression was abnormal, Hu Zhijun was a little strange, and he walked towards Gudamai and shouted a few times.

"Platoon...... Platoon leader....... Gu Damai's straight eyes slowly rolled, and he stammered to Hu Zhijun: "I...... I remember...... I finally remembered ....... ”

"Remembered? What do you remember? Hu Zhijun was a little puzzled, he asked.

"It! I remembered what it was! Gudamai raised his hand and pointed to the strange building in front of him, and said in a somewhat trembling voice, "This is Alivasti's palace!" The legendary Alivasti! I'm so stupid, I should have remembered it a long time ago, platoon commander, let's go! Let's get out of here! If Alivasti wakes up, we won't be able to escape! ”

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