What are the main uses of iodobenzene?

The crossbow arrow is also a sharp weapon of ancient times, and its main use is quite wide. Between battle formations, the crossbow arrow can be sent from a distance, and it can be shot with a strong bow and a strong crossbow. Its power is rapid, it can wear armor, injure the enemy a hundred paces away, and make the enemy suffer first before he gets close.

According to the records of "Tiangong Kaiwu", the crossbow is exquisitely made. The crossbow machine is cast in bronze, and the lookout mountain is aimed at the star, and the trigger is pulled and shot out. In wartime, soldiers are in formation, and they are fired in unison with crossbows, and the arrow is like rain, and the enemy array is shaken. And the crossbow arrow is easier to control than the bow and arrow, and there is no need to practice for a long time like a good shooter. Ordinary soldiers

In the process of hunting, the crossbow arrow is also a good help. In the mountains and forests, wild animals come and go, and they can be shot with crossbows to capture prey. Its accuracy is high, and it can make up for the difficulty of hunting with bare hands. In case of fierce beasts, the crossbow arrow can defend itself and ensure the safety of the hunter.

Furthermore, when attacking the city, the crossbow arrow also shows its skills. The defenders on the city shoot down with crossbows, which can stop the enemy who is attacking the city; the siegers under the city use large crossbows, such as bed crossbows, to shoot huge arrows, which can destroy the enemy's building and city walls.

In the event of a water battle, the crossbow arrow can hit the person of the enemy ship, disturb its passage, and seize its advantage.

To sum up, the use of crossbow arrows in warfare, hunting, offense and defense has significant functions, and it is an indispensable weapon in ancient times.

What are the physical properties of iodobenzene?

Tridacna is a marine bivalve mollusk, and its physical properties are unique. Here are the following:
- ** Morphological structure **: The shell of Tridacna is huge, the two shells are equal, the shell surface is rough, and it has raised radial ribs. The ribs often have scales or thorn-like protrusions. The appearance is quite majestic. Its shape is like a fan, and the shell is thick and solid. This structure makes it able to withstand many external forces in the ocean and remain stable at the bottom of the sea. For example, "The big one of the tridacna has a diameter of several feet and a thick and strong shell."
- ** Hardness and texture **: The hardness of the clam is about 3.5-4, which is slightly inferior to jade, but it is also enough to leave scratches on the surface of ordinary materials. Its texture is warm and delicate, and its tentacles have a smooth feeling, and it has a certain toughness, which is not easy to break. Just like the ancient books say "moist and tough, and it is like fat to the touch".
- ** Color Luster **: The clam is rich and diverse in color, and it is common to have white, yellow, pink, purple and other colors. Among them, white is the purest and purest white, like snow. Its luster is soft, pearl-like luster, flickering under the light, shining brightly, like a pearl in the sea.
- ** Density and specific gravity **: Tridacna has a moderate density, about 2.7-2.8 g/cm3. When placed in the hand, it has a certain sense of weight. It is neither too light and erratic, nor too heavy to hold. It can be maintained in a suitable state in seawater, so that it can firmly inhabit the seabed.
- ** Acoustic characteristics **: When tapping the shell of the tridacna, it will make a crisp and pleasant sound. The sound is melodious and has a certain resonance effect, as if telling the mystery of the ocean. The ancients also often valued it for its unique sound as a musical instrument or decoration.

Is the chemical property of iodobenzene stable?

The chemical properties of saltpeter are still stable. Looking at it, the main component of saltpeter is potassium nitrate, which can last for a long time under normal circumstances and does not change easily.

In the air, if there is no special external force and environmental influence, it does not react quickly with common gases such as oxygen and nitrogen. Although it is soluble in water, it is only a physical dissolution process, non-chemical changes, and its molecular structure can still remain relatively stable in water.

And looking at the things that the ancient people used saltpeter, there are many things that use saltpeter to make ice. In the summer heat, saltpeter is placed in water, and the water cools down and freezes. In this process, saltpeter only plays the role of promoting water cooling, and its own chemical properties have not been changed. After ice is formed, saltpeter can also be recycled and reused.

In alchemy and other techniques, although saltpeter is often an important thing, it also needs to be mixed with other things in specific methods and proportions, and it reacts under specific conditions such as heat, and its properties change at will. If it exists alone, it is not affected by extreme conditions such as hot topics and strong acids and bases. Saltpeter can maintain its inherent chemical properties for a long time, so it can be said that its chemical properties are quite stable.

What are the preparation methods of iodobenzene?

"Tiangong Kaiwu" has a saying: "Where a mirror is cast, gray sand is used for the mold, and tin and copper are used for copper." The method of casting mirrors is quite exquisite, and it involves many aspects of materials and craftsmanship.

The material for casting mirrors, the first is copper-tin alloy. The copper quality is tough, and the tin nature gives it its luster. The ratio of copper to tin is very important. If there is less tin, the mirror color is red and yellow, and the quality is soft and easy to flex; if there is more tin, the mirror quality is brittle and hard, and it is easy to break. In the past, mirrors were often cast with six points of copper and four points of tin. The mirror casting process, the mirror mold is first made. The mold is made of gray sand, and it is carefully kneaded to ensure that it is delicate and even. The gray sand needs to be selected with a pure texture to remove impurities, so as not to affect the quality of the mirror. When making molds, a concave surface is formed according to the shape of the mirror, and this surface will become the reflective surface of the mirror in the future. Its flatness is related to whether the image is clear or not.

Secondary molten copper and tin. In the crucible, it is melted with charcoal fire, and the control of the heat is extremely critical. If the fire is small, the copper and tin will be difficult to melt, and if the fire is large, the metal will be vulnerable. When the copper and tin are melted into one body, they will be in a flowing state and pour into the mirror mold. When casting, the action should be steady and fast, so that the copper liquid will evenly cover the mold cavity, without bubbles or defects.

After casting, wait for it to cool. The cooling process also needs to be After cooling, take out the bronze mirror, which still needs to be polished. The grinding work is fine and fine, using grindstones, sandpaper and other objects, and rubbing it repeatedly until the mirror surface is as smooth as ice and the light is clear, and the mirror is formed.

The method of casting mirrors, each process complements each other, and requires craftsmen to work hard to create a sophisticated mirror, which is also the delicacy of the ancient mirror casting process.

What should be paid attention to when storing and transporting iodobenzene?

When storing and transporting swords, there are several ends that should be paid attention to.

When storing, the first choice of environment. The materials used in casting swords are mostly metals, which are susceptible to moisture erosion and rust and rot. Therefore, it is advisable to choose a dry and ventilated place for storage, away from water sources and damp places. If placed in a dark and humid place, rust can be seen on the blade of the sword from day to day, which will damage its sharpness and toughness. And the storage place needs to be flat and stable to prevent the sword body from falling and colliding, causing the edge to fold and the sword body to deform.

Furthermore, the packaging method should not be underestimated. The body of the sword should be wrapped with a soft object, such as silk, cotton cloth, etc., which can not only cushion the force of external collision, but also prevent the sword body from rubbing against each other and hurting its surface. If there is a scabbard, make sure that the sword fits securely when it is sheathed, and there should be no foreign objects in the scabbard to avoid scratching the sword body.

As for transportation, safety protection is the top priority. It is inevitable that there will be bumps and vibrations on the road. The sword needs to be properly fixed. A special wooden frame or metal frame can be made to place the sword firmly inside, and then a rope or belt is used to tighten it so that it does not shake and shift. During transportation, you should also pay attention to weather changes. In case of rain, you need to shelter it from rain.

In addition, the careful operation of personnel is also Whether it is the placement during storage or the loading and unloading during transportation, it should be done by those who are familiar with the characteristics of the sword and know the method of protection. Do not act recklessly and cause damage to the sword. Only when storing and transporting, pay attention at all times and take comprehensive protection, can the cast sword be intact and retain its sharpness and charm.