Mercury, commonly known as mercury, is a liquid at room temperature, with a metallic luster and a silver-white color. Its nature is active, easy to flow and evaporate.
Bromine is the only non-metallic element that is liquid at room temperature and pressure. It is dark red-brown in color and has a strong irritating odor. It is highly volatile, forming a reddish-brown toxic smoke.
Diethyl ether is a colorless and transparent liquid with a special irritating odor. It is sweet and volatile, and its vapor is heavier than air.
All three have special chemical properties. Mercury's chemical properties are relatively stable, and it is not easy to combine with oxygen at room temperature. However, it can react with sulfur, chlorine and many other substances. Mercury can dissolve many metals to form amalgam, which is widely used in metallurgy and other fields.
Bromine is chemically active and a strong oxidizing agent. It can react with many metals and non-metals. For example, bromine can react violently with sodium metal to form sodium bromide; it can also react with hydrogen under heating conditions to form hydrogen bromide.
Diethyl ether has relatively stable chemical properties, and is quite stable to alkalis, oxidants, and reducing agents. However, diethyl ether is flammable, and its steam and air can form an explosive mixture. In case of open flame and high heat, it can cause combustion and explosion. This characteristic requires special attention when using and storing.
All three have important uses in industry, scientific research, and other fields. Mercury is often used in the manufacture of thermometers, sphygmomanometers and other instruments; bromine is widely used in the pharmaceutical, dye, flame retardant and other industries; diethyl ether is often used as a solvent, anesthetic, etc. However, due to the three or toxic, or flammable and explosive, it is necessary to follow strict operating procedures and safety measures when using to prevent harm to human health and environmental safety.

If it is hot, it is still alive. Its density is small, and it is not in the air, so it can often rise in the air. It is flammable, and in case of open flames, high-temperature flammable explosions, ignition, oxygen synthesis and water production, which in turn puts a lot of heat.
As for diethylene, it is an important catalyst in the process of chemical conversion. Its physical properties are special, and it is often in the shape of a solid. The color of diethylene can vary from light to brown, and the outer color is low. Its melting and boiling are different due to the degree of heat. In addition, under normal conditions, the properties of diethylene are not fixed, but when encountering a specific reaction element, it can demonstrate its catalytic activity, which can promote the reaction rate and change the reaction rate. However, the amount of reaction resistance is basically different before the reaction, which is the characteristic of catalysis.

"Tiangong Kaiwu" says: "Mercury, its quality is silver, and its gas is Dan sand. Mercury is used in the world, and there are many ends." And for diolefins, its uses are also quite extensive.
Diolefins, especially 1,3-pentadiene, are important raw materials in the chemical industry. They can participate in many polymerization reactions, and through this reaction, polymers with different properties can be obtained. For example, in the manufacture of synthetic rubber, 1,3-pentadiene plays a key role. Synthetic rubber is indispensable in modern industry, transportation, daily life and many other aspects. In the manufacture of automobile tires, synthetic rubber can endow tires with good wear resistance, elasticity and anti-aging properties, ensuring the safety and stability of vehicle driving.
Furthermore, 1,3-pentadiene can be used in the synthesis of fine chemicals. Fine chemicals cover many fields such as medicine, fragrances, and pesticides. In pharmaceutical synthesis, as a key intermediate, it helps to synthesize compounds with specific pharmacological activities, making great contributions to human health. In the synthesis of fragrances, it can synthesize fragrances with unique aromas, which can be used in cosmetics, food and other industries to add to the charm of products.
In addition, in organic synthesis reactions, 1,3-pentadiene acts as an active reaction substrate, which can react with a variety of reagents for addition and cyclization to build complex organic molecular structures. In the field of organic synthesis, such reactions are often used to create organic compounds with new properties and functions, promoting the development of cutting-edge fields such as materials science and drug research and development.
From this perspective, 1,3-pentadiene plays a significant role in the chemical industry and related fields, providing key support for the development of many industries, and is an indispensable chemical raw material.

The methods for refining mercury (mercury) and mercury disulfide (cinnabar) in "Tiangong Kaiwu" generally include the following:
First, take cinnabar (cinnabar) and place it in a special kettle, calcined at high temperature over charcoal fire. The cinnabar is thermally decomposed, and the mercury element is turned into a gaseous state and rises in the kettle. Then, a condensation device is placed on the top of the kettle to make the mercury vapor condense when cooled, and complex into liquid mercury, which is a more common method. Because of the cinnabar, mercury and sulfur are closely combined, and then under the force of high temperature, the sulfur is easily converted into sulfur dioxide and dissipated, and the mercury is separated due to its volatile nature.
Second, mercury can also be purified by wet method. First, the cinnabar is ground into a very fine powder, placed in a special container, and soaked in an appropriate amount of dilute acid solution. The cinnabar is placed in the acid solution, and under specific conditions, the mercury element can be converted into an ionic state and dissolved into the solution. Then, an active metal (such as iron, etc.) is put into the solution. According to the order of metal activity, the active metal can replace the mercury ions, and the mercury then precipitates in elemental form and sinks at the bottom of the container. This is also a way to obtain mercury.
As for the preparation of mercury disulfide (cinnabar) from mercury, the method of synthesis is mostly used. Mercury is placed in a reaction vessel, and an appropriate amount of sulfur vapor is introduced. Mercury and sulfur react at a certain temperature, and the two combine to form mercury disulfide. It is necessary to pay attention to control the reaction temperature and the amount of sulfur. If the temperature is too high or the amount of sulfur is inappropriate, it may affect the purity and quality of the product. Or in solution, the reaction of mercury salt and sulfide solution can also generate mercury disulfide precipitation. After precipitation, filtration, drying and other processes, relatively pure mercury disulfide can also be obtained.

"Tiangong Kaiwu" has a saying: Brine is the essence of salt. In the storage and transportation of two water tanks, there are three things to pay attention to.
First, the place of storage must be a place of high dryness. Cover brine and like moisture. If it is in a humid place, it is easy to deliquescence and loss, causing damage to its quality. And it is necessary to have strong warehouses to prevent wind and rain erosion and rats and insects from eating. The warehouse should also be set up with shelves and layers, so that the brine bags are arranged in an orderly manner, which is convenient for inspection and access.
Second, when transporting, the utensils are very important. The cars and boats used must be clean and free of pollution, so as not to mix contaminants into the brine and damage its quality. And the wheels of the car and the boat should be intact to ensure smooth transportation and prevent the halogen from falling over. In addition, the itinerary should be based on the situation and avoid bad weather such as floods, wind and snow to prevent delays or damage to halogen products.
Third, the deployment of manpower should not be ignored. Those who manage the storage should be familiar with the halogen nature and take care of it carefully; those who are responsible for transportation should be diligent and patient, and abide by the rules. Everyone performs their duties and works together to ensure that the storage and transportation of halogen are smooth.
In this way, in the storage and transportation of halogen, pay attention to these three things, so as to protect the quality of halogen and smooth the flow of halogen, so as to meet the needs of people's livelihood.