The rudimentary version of the hydraulic press slowly took shape under the design of Li Qinzai.

The water from the reservoir poured into the large iron tank, which was soon filled.

Everyone looked at Li Qinzai in disdain, waiting for his next order.

Li Qinzai stood beside the water press with his hands in his hands like a general who scolded Fang Xuan, waved his hand at the ministry, and the water injection port immediately cut off the water source.

Seeing that everyone didn't know why, Li Qinzai smiled and said to the blacksmiths: "Can you beat a piece of iron as thin as a cicada's wings?" ”

The blacksmiths shook their heads in unison.

Iron pieces are naturally made, and many hairpins used by the ladies of powerful families, as well as various delicate small objects used for decoration, need to use iron or gold pieces, and blacksmiths can do it.

However, putting aside the big iron piece is a hooligan.

They can make iron pieces the size of fingers and even palms, but the iron pieces that are square and round are as thin as cicada wings, and no one in the world can make such a craft.

The status quo of this era is like this, refining metallurgy, etc., relying on individual craftsmanship is actually very limited, no matter how strong the craftsmanship is, it is really difficult to have a square circle of iron sheets, not to mention that the entire iron sheet remains thin as cicada wings, which is basically impossible to achieve.

Li Qinzai also knew the current situation of handmade iron smelting, and said with a smile: "Let you open your eyes today." ”

So Li Qinzai instructed the blacksmith to burn a huge piece of iron red, beat it until it was a round cake, and then put it in a furnace to be calcined.

The tongs took the reddish round cake-shaped piece of iron out of the stove, and Li Qinzai had it placed between the anvil and the ingot of the hydraulic press, and then ordered the part to crack the buckle between the piston and the iron cylinder at the same time.

There was a loud bang, and the iron ingots filled with water in the upper part fell with the huge pressure, and smashed the red round cake iron.

After the loud bang, sparks flew everywhere, and the round cake that was originally the thickness of the little finger was violently hit by the iron ingot, and instantly became only half the thickness of the little finger.

"Go on, three more times." Li Qinzai ordered.

The girders quickly pulled the pulleys, and the huge iron ingots slowly rose, and at the same time, the round cake iron was stuffed into the furnace and continued to be calcined.

When the ingot is raised to the top, the calcined red cake is taken out again and placed between the ingot and the anvil.

The huge iron ingot fell again, and after a loud bang, the iron block the thickness of half a thumb instantly turned into a slightly thicker piece of iron, only about a centimeter thick.

"Go on." Li Qinzai commanded.

The same process came twice, the blacksmith took out the iron sheet with pliers, poured water on the surface to cool it, and everyone gathered around and measured the thickness of the iron sheet with two fingers.

I was surprised to find that it was as thin as a cicada's wings, and the surface was smooth and flat, without any unevenness, just like a beautiful work of art.

It is a work that a blacksmith's hammer could never have struck under any circumstances.

Everyone was stunned, as if they had cast an immortal spell, the piece of round cake iron with the thickness of a little finger just now, after only four strikes, became a piece of iron as thin as a cicada's wings in front of them.

The layman looks at the bustle, and the insider looks at the doorway.

The onlookers only thought it was remarkable, but the blacksmiths were all experts, and they knew very well how difficult it was to beat a piece of iron into such a thin piece of iron, and it was almost impossible to do it by manpower.

"Li, Uncle Li, this ...... Is it true? A blacksmith stared blankly at the piece of iron in front of him, still in disbelief.

"It's fake, it's all your hallucination, you've been too tired lately, go back and sleep." Li Qinzai said softly.

The blacksmith was stunned and touched the piece of iron that was still warm, and his whole body was excited: "No, it's true!" It is simply ...... to be able to create pieces of iron as thin as cicada's wings. It's Xianfa'er, right? ”

"How it came out, you saw it with your own eyes." Lee didn't intend to explain it too clearly to the blacksmith, because he certainly didn't understand.

Turning around and beckoning to the onlookers in the crowd, Li Qinzai said, "You all get closer, do you think you can be indifferent to everyone by blending into the crowd?" I still see you stupid in the crowd at a glance, it's too stark. ”

The students were so embarrassed that they consciously stepped forward one by one and observed around the iron piece.

Li Qinzai said lightly: "You always say that arithmetic is too complicated and boring, and you don't understand why I often say that arithmetic is just a tool. ”

"So today I will show you for yourself why arithmetic is just a tool, and for whom it serves."

"This piece of iron, you watched it take shape with your own eyes, so how did it come into shape? Why is it that what a blacksmith can't make by hand, this big guy I can make in a few clicks? ”

Facing the inquiring eyes of the students, Li Qinzai said slowly: "This piece of iron is also a science, it is called 'physics', and the physics knowledge I used just now is one of the small categories, called 'Newton's third law'...... Well, no, it's called 'The Third Law of the Beginning of the Morning'. ”

Li Qinzai puffed out his chest and met the adoring gaze of everyone without guilt.

Who was Newton? His grandfather's grandfather's grandfather's grandfather is still only single-celled, I'm sorry, I was reincarnated early, let me come first.

"The so-called 'third law', its essence is the law of collision between objects, the force of action and reaction must be equal, it doesn't matter if you don't understand what force is, keep your ignorant eyes open......"

"For example, you are so stupid, I am angry, so I raised my hand and slapped you, and my face hurts, right? But if you fan others, you will know that in fact, the hand is also very painful, and this is the force and the reaction force. ”

"The iron piece in front of you is formed by the impact of action and reaction force, the force is mutual, and the density and volume of the object under the force are different, which will determine whether the shape of the object can be changed after impact......"

Seeing that the students' eyes were still wide in surprise, Li Qinzai said slowly: "This science is called 'physics', what I just said is the introductory knowledge of physics, when you understand what I just said, congratulations, you have half a foot into the new world of 'physics'." ”

"This thing I made, called 'hydraulic press', it can forge large pieces of iron, so that the iron can reach a more precise standard, whether it is people's livelihood or military, can change the world, but you must know that it is not the hydraulic press that changes the world, but physics that changes the world."

The students bowed to Li Qinzai one after another.

"Thank you, sir."

Behind Li Qinzai, the blacksmiths also saluted with red eyes: "Thank you Li Xianbo for his teachings, although the villain can't understand it, but the Tang Dynasty has such a talented national weapon as Li Xianbo, which is the blessing of the community and the blessing of the people." ”

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