pyridine, 2-(chloromethyl)-4-(trifluoromethyl)-

The chemical properties of this product are also related to its composition and chemical reaction characteristics. Although "Tiangong Kaiwu" does not directly describe the chemical properties of a specific product, many of the books involve the material properties and changes of various things, and the outline of the relevant chemical properties can be inferred from it.
As for hardware, the chemical properties of gold are stable, and it is not easy to chemically react with other things, so it can always retain luster and last for a long time. The so-called "Where the gold is the heaviest, each copper square inch weighs one or two, and the silver square inch weighs three coins; if the silver square inch weighs one or two, the gold square inch weighs two coins. Where the gold is soft, it can be bent like a branch willow." The weight and softness of gold also suggest that its chemical stability is not easy to be eroded by ordinary substances.
As for silver, its chemical properties are slightly more active than gold. If it is left in the air for a long time, or when it encounters sulfur-containing substances, it is easy to rust. It is also due to chemical reactions with sulfur. The book talks about the smelting and use of silver, which shows that it can be combined with other substances under certain conditions.
Looking at the clay again, the chemical properties of clay are fire-resistant. "Where mud is used to make tiles, more than two feet of earth is dug, and no sand clay is selected. Where the billets are ready, after drying, they are piled up in the kiln and burned on fire. Or one day and night, or two days and nights, depending on how much the pottery is temporarily extinguished." The clay can be made into strong ceramic tiles after being fired at high temperature. Due to its chemical composition, it can maintain structural stability at high temperatures and will not melt and dissipate, which is due to the chemical properties of fire resistance.
And like lime, its chemical properties are lively. "All lime is refined by fire. After it is formed, it will never be damaged when it enters the water. Hundreds of millions of boats and hundreds of millions of walls, choking and preventing lewdness, it is necessary." After calcination, lime will react violently in contact with water, forming slaked lime, and it is cohesive, which can be used for waterproofing, building walls, etc. This is the embodiment of its unique chemical properties.
From this perspective, although "Tiangong Kaiwu" does not describe the chemical properties of products in detail in today's chemical terms, the chemical properties of various products are hidden in various process descriptions, leaving precious clues for future generations to explore the characteristics and changes of ancient materials.

The main purpose of this product is to cover many aspects.
First, in the field of production and labor, it has a crucial function. For example, in workshops, it can help craftsmen carve utensils, making the process more convenient and accurate. Taking woodworking as an example, a delicate tool can make wood cut neatly and splice seamlessly, greatly improving the efficiency of labor and the quality of products, so that the output is excellent.
Second, it also has significant functions in daily use. Ordinary people use this to deal with all kinds of trifles. For example, when home repairs, a lightweight appliance can help homeowners tighten objects, dredge pipes, solve the difficulties of life, and make daily life more smooth.
Third, it is also indispensable in the process of military conquest. Weapon production and fortress construction all rely on its strength. Sharp weapons blades and solid barriers are built because of related products, providing strong support for defending the country and winning wars.
Fourth, in the realm of artistic creation, it is also the key to helping. Painters need excellent brushes and paints to paint things; craftsmen shape things, relying on tools and equipment at their disposal. In this way, they can turn the wonderful ideas in their hearts into masterpieces in reality and pass them on to future generations for people to appreciate.
Fifth, it is also of great value in the field of academic research. Scholars need precise instruments and equipment to explore the mysteries of physics and chemistry; to study history and archaeology, they also rely on the excavation and textual research of tools at their disposal. Helpers are in the ocean of knowledge, breaking the waves and exploring the truth.
All these show that this product is widely used and plays an indispensable role in all aspects of society, with far-reaching influence and great significance.

The production process of a certain product is crucial to the quality of the product. Today, imitating the literary style of "Tiangong Kaiwu", the process is described as follows.
At the beginning, the selection of materials must be fine. The material taken should have a high-quality texture to meet the required characteristics of the product. For example, if it is made of wood, it needs to have fine texture, tough texture, and no defects and spoilage. When picking materials, it also follows the season and method to make the material perfect.
Then, the materials are prepared in an orderly manner. The selected materials are cut and rectified according to the specifications and sizes. For example, stone, according to the shape of the design, is cut with an axe and sawed to remove its excess and make it regular. In the meantime, the degree of division must be accurate, and the difference of the millimeter may affect the quality of the subsequent process and the finished product.
As for the production, the process is complicated and delicate. Taking the casting tool as an example, the mold is first made, and the precision and coarseness of the mold are related to the beauty and evil of the cast product. Use delicate clay or fine sand to shape the object, so that the lines are smooth and the shape is realistic. Then melt casting, control the temperature of the heat, so that the metal solution flows smoothly, pour it into the mold, and wait for it to condense and form. In this process, the heat is the key. If it is overheated, the metal texture will become inferior, and if it is too cold, it will be difficult to form, resulting in defects.
After forming, the modification and polishing should not be ignored. To the surface of the utensils, or there are rough and uneven, cast mark defects, need to be carefully polished with sand, gravel, files, etc., to make it smooth and bright. If it is lacquer art, paint layer by layer, each layer needs to be dry and evenly applied, so that the color can be warm and delicate texture.
Finally, the inspection is strict. Examine the finished product one by one to see if there are any defects in its appearance, check whether its size is in compliance, and check whether its performance is up to standard. If there is a slight discrepancy, it will be corrected or discarded. After this rigorous craftsmanship, you can get excellent products.

When storing and transporting this product, there are many key issues to be paid attention to.
When storing, the temperature and humidity of the environment are the first priority. If the temperature and humidity are too high, the product may become moldy due to moisture, or the quality may deteriorate due to heat; conversely, if the temperature and humidity are too low, it may also change the characteristics of the product. For example, many powdery things are easy to agglomerate in an environment with high humidity, which affects their original properties and use; for example, some products that need to be stored at constant temperature have excessive temperature fluctuations or cause their active ingredients to be inactivated. Therefore, when storing, there should be precise temperature and humidity control equipment, and it is necessary to maintain a suitable temperature and humidity range according to the characteristics of the product.
Secondly, the storage place should be kept clean to avoid dust and foreign matter mixing in. If the product is contaminated with impurities, not only the appearance will be damaged, but its internal quality will also be affected, and it may even endanger the user. Furthermore, the products should be stored in an orderly manner according to the category and batch, which is convenient for management and inspection. Different batches of products may have different production dates and shelf life. Orderly storage can avoid confusion, and it is convenient to follow the principle of "first in, first out" to ensure that the products can be used properly during the shelf life.
As for the transportation process, shock resistance is crucial. During transportation, the products will inevitably encounter bumps and collisions. If they are not properly protected, fragile products are easily damaged. Therefore, appropriate cushioning materials, such as foam, air cushions, etc., should be used to fully wrap the product to reduce the risk of collision injury.
In addition, the hygiene of the means of transportation should not be underestimated. Unclean means of transportation or contamination of products, especially food, medicine and other products with strict hygiene requirements. At the same time, the transportation time should also be controlled to shorten the transportation time as much as possible, reduce the risk of products in transit, and ensure that the products are delivered to the destination in good condition.

There is a tool today, and everyone asks about its involvement in the environment and human health. This tool, if all the utensils mentioned in "Tiangong Kaiwu" are related to the operation of the world and human life.
All utensils are related to the environment, and there are both profit and loss ends. If the material for making utensils is collected from mountains, rivers and forests. Those who are good at picking, follow the time of the day, according to the location, and do not waste natural things, then the mountains, forests and rivers will always be alive and the environment will not be damaged. If the season is ignored and the exploitation is excessive, the mountains and rivers will dry up and the environment will be greatly damaged. And there must be a way to make utensils. Those who are good at the law save materials and energy, have waste, and do not sewage the soil; those who are not good at the law, the consumables are expensive, the waste is messy, and the dirty soil is stained with water, which is not a shallow disaster.
As for human health, there are also differences. If the system of utensils is good in material, non-toxic and harmless, and convenient to use, it will be beneficial to human health. If clay is used as a utensil to serve food, its nature is mild, and it is not harmful to things, and people can use it to maintain their health. However, if the utensil is made of bad material, it is poisonous and filthy, and if it is used, the disease will enter through the mouth. And if the design of the utensil is improper, it will be inconvenient to use, or cause people to be tired and damaged
When looking at this device, it is necessary to observe its materials in detail and examine its methods in detail. The selection of materials should be natural and harmless, the production should be energy-saving and material-saving, and the waste should be properly disposed of. In this way, it will be harmless to the environment and beneficial to people's health. Otherwise, it may cause harm to the environment and worry about people's health. When learning from the good laws of the ancient times, the good policies of today should be helpful, so that the utensils can be made into a beautiful environment and people are healthy.