butylpyridine

In "Tiangong Kaiwu", the main use of ramie is quite extensive.
Ramie can be used for textile. Its fibers are slender, tough, and shiny, and the woven cloth is light in texture and has good air permeability. In ancient times, ramie cloth was often used to make clothes, and people used clothes made of this cloth every day. Because of its good moisture absorption, it can keep the skin dry in summer, and its cloth surface is crisp and not easy to wrinkle, so it is very popular with the people. In many dynasties, ramie cloth was also an important tax material, which shows its importance in the textile field.
Furthermore, ramie is also very useful in papermaking. The characteristics of ramie fiber make it a high-quality papermaking raw material. The paper made of ramie is tough and durable. Many important books and documents in ancient times were often written and recorded on ramie paper, because it can be preserved for a long time over time and is not easy to break or rot. This is of great significance to the inheritance of culture, and many precious ancient books have been passed down to this day.
In addition, ramie is also indispensable in the preparation of ropes. The ramie fiber has high strength, and the ropes woven with this are sturdy and durable, and are widely used in production and life. For example, the ropes used in navigation need to withstand huge tensile force, and the ropes made of ramie can be competent to ensure the safety of ships' navigation. In construction, handling and other labor, ramie ropes also play an important role in helping to lift and pull all kinds of heavy objects. From this perspective, ramie is an important item in textiles, papermaking, rope weaving, etc. It is widely used and has a profound impact on the development of ancient people's livelihood, economy and culture.

Mercury, its physical characteristics are very different. "Tiangong Kaiwu" has a cloud, mercury is a metal, under room temperature, it is a liquid state, shining brightly, like silver flowing, one of which is also.
Mercury has excellent fluidity, is placed on a flat surface, rolls freely, unlike the solid shape of other things, and is difficult to change at will. And its density is quite large, and its heavy feeling is significant. If you take it by hand, you can feel its heavy momentum, and the other is also.
Furthermore, mercury is volatile. Although it is difficult for the naked eye to detect its volatile state, when it is in an open container, its amount decreases over time. In warm places, it evaporates faster. This is one of the major characteristics of mercury, and it needs to be treated with caution to prevent the spread of toxic gases and endanger human health.
The reaction between mercury and other substances is also unique. In case of sulfur, the two quickly combine to form mercury sulfide, which is brightly colored. This reaction is often used for the decontamination or extraction of mercury. And mercury can dissolve a variety of metals to form amalgams. This property is used in many fields such as metallurgy. For example, the ancient technique of gilting relied on amalgam.
Mercury has a relatively low boiling point, and it turns into steam when heated to 357 degrees Celsius. This makes it possible to separate it from other substances by distillation in some chemical operations. However, because its steam is toxic, when operating, extra care should be taken to prevent toxic gas damage. In short, mercury has unique physical properties, and when it is used, it must be carefully inspected and used rationally to obtain its benefits and avoid its harm.

Lead-based alloys, the stability of their chemical properties is related to all things, and cannot be ignored. Looking at the description of "Tiangong Kaiwu", we can know one or two.
Lead is soft and heavy in nature, and its alloy also bears its properties. Lead-based alloys react slowly with many substances at room temperature. In case of ordinary water, although time passes, it is difficult to see significant changes. Cover the surface of lead, a layer of oxide film is prone to form. This film acts as a shield, which can block the contact between water and internal lead, making the reaction difficult.
As for acids, dilute hydrochloric acid and sulfuric acid meet lead-based alloys, and the initial reaction is still small. However, nitric acid is not the case, even dilute nitric acid can react quickly with lead-based alloys. This is because nitric acid has strong oxidizing properties, which can break the oxide film on the surface of lead, causing lead to react quickly with nitric acid and produce lead nitrate and other substances.
In alkali, lead-based alloys are relatively stable. Common sodium hydroxide solutions coexist with it, and it is rare to react. This is because lead and its alloys, in alkaline environments, have a protective layer on the surface, so that the alloy is not eroded by alkali.
Furthermore, when heated, the chemical properties of lead-based alloys also change. When the temperature increases, its reaction with oxygen intensifies, and lead can be oxidized to lead oxide. If there is sufficient oxygen and the temperature is high, the reaction will be faster, and the surface of the alloy will change color and quality will also change slightly.
In summary, lead-based alloys are stable to water and alkali at room temperature, slow to dilute hydrochloric acid and dilute sulfuric acid, and sensitive to nitric acid. When heated, the reaction with oxygen intensifies. The stability of its chemical properties varies depending on the environment and conditions.

In the process of production, many things need to be paid attention to.
First of all, the quality of the material is essential. Good materials are the foundation of good quality, and they can be preserved in order to protect their health and profits. If they are mined in mountains, they must be inspected. If they are dense and well-distributed, if they are not, they are prone to pores and trachoma, which makes the body fragile and becomes a sharp weapon.
Second time, the heat should not be missed. If the fire is too fierce, the fire will melt and it will be destroyed; if the fire is insufficient, it will melt and become a powerful weapon. The metallurgist's eye is sharp, and he observes the heat conditions, such as the color of the fire in the middle, the first red, the orange, to the white and strong, the best melting of the square. And the smelting, it is necessary to add materials, and the composition of the finishing, in order to increase its performance.
In addition, the shape of the technology is also good. The mold must be engraved and carved, and the size is fine. If the shape is not good, the shadow should be held so that the water should be well and evenly filled, so that the cavity should be filled, and no gaps should be left. When the water is cooled, the initial blank needs to be polished.
When it comes to grinding, first remove the burrs from the coarse stone and repair the rough surface. Use the fine grinding of the stone to make the body as smooth as gold. The grinding force is uniform, whether the blade is thick and thin, the effect of shadow cutting. And the hardening of the blades is even more important. The degree of the quenching liquid and the immersion of the body are all well grasped. Quenching is urgent, and it is easy to be brittle; quenching is difficult, and the edge is not beneficial. Only when each person carefully handles it can it be cut like mud and soft.

Today's technology is changing with each passing day, and it has a far-reaching impact on all things in the world. Among them, nanosensors, although they are as tiny as minuscule, their impact on the environment should not be underestimated. Just like what "Tiangong Kaiwu" said, things have their own characteristics, and if they are used properly, they are of great benefit.
Nanomaterials, with their unique size effect and surface effect, have excellent performance and are widely used. In the field of environmental monitoring, their sensitivity is extremely high, which can accurately detect fine pollutants, making monitoring more efficient. For example, nanosensors can keenly sense heavy metal ions in water, which are like the eyes of the gods, making pollution invisible. This is a tool for protecting the environment.
Of course, everything has two sides, and nanomaterials are no exception. Its tiny particle size is easy to spread and migrate in the environment. Once it enters the ecosystem, it may have unknown effects on organisms. And the production process of nanomaterials, or the generation of waste, if not disposed of properly, will also pollute the environment.
Gu Yun: "Water can carry a boat, but it can also capsize it." Nanomaterials are not only helpful to the environment, but also have hidden worries. Our generation should make good use of their benefits, explore their harms in depth, and use scientific methods to seek advantages and avoid disadvantages. When developing and producing, we should pay attention to environmental protection and follow the way of nature, so that nanomaterials can be used for the well-being of the environment, not for disaster. In this way, we can protect green waters and green mountains and coexist in harmony with nature in the path of scientific and technological progress. This is our generation's unshirkable responsibility.