pyridine, 2-chloro-5-fluoro-4-iodo-

The properties of mercury and mercury are liquid metals at room temperature, with a silver-white and metallic luster, heavy and good fluidity. Its density is quite high, about 13.59 grams/cubic centimeter, which is heavier than that of common metals such as water. And the melting point of mercury is extremely low, -38.87 ° C, and the boiling point is only 356.6 ° C. This property makes mercury mostly liquid in common environments.
Mercury has good electrical conductivity, although inferior to good conductors such as gold, silver, and copper, it also has considerable electrical conductivity among metals. Mercury's thermal conductivity is also average, not an excellent thermal conductor.
Furthermore, mercury is volatile and can slowly dissipate into mercury vapor at room temperature and pressure. This mercury vapor is toxic and can endanger health and damage important organs such as the nervous system and kidneys when inhaled by the human body.
Mercury has relatively stable chemical properties and is not easy to combine with oxygen at room temperature. However, when heated to a certain extent, it can react with oxygen to form mercury oxide. Mercury can also form amalgams with various metals. This amalgam is quite used in metallurgy, dentistry and other fields.
Mercury from rivers, if accidentally infused, often sinks to the bottom of rivers due to its high density. However, its volatility allows it to partially escape into the atmosphere in water, and mercury can be converted into methylmercury by microbial action in water. Methylmercury is highly fat-soluble, easily absorbed by aquatic organisms, enriched by the food chain, and ultimately endangers human health.
Mercury's properties make it useful in many fields such as industry, medical treatment, scientific research, etc. However, due to its toxicity, use and disposal should be done with caution to prevent harm to the environment and humans.

Mercury, bromine, and iodine are all halogen elements, each with unique chemical properties.
Mercury is a liquid metal at room temperature, with a silvery white luster, volatile, and highly toxic vapor. Its chemical properties are relatively stable, and it is not easy to combine directly with oxygen, but when heated, mercury oxide can be formed. Mercury can form amalgam with many metals, which is widely used in metallurgy and other fields. And mercury can react quickly with sulfur powder to form mercury sulfide, which is often used as an emergency treatment method when mercury leaks.
Bromine is the only non-metallic element that is liquid at room temperature and pressure. It is a dark reddish-brown smoky liquid with a strong pungent odor and strong corrosiveness. Bromine is chemically active. It is a strong oxidizing agent and can react with a variety of substances such as metals and non-metals. If it reacts violently with sodium metal, sodium bromide is formed; it can be combined with hydrogen under heating or light conditions to produce hydrogen bromide.
Iodine is a purple-black solid under normal conditions, with a metallic luster, easy to sublimate, and its vapor is purple. Iodine is also chemically active. Although its oxidation is slightly inferior to that of bromine, it can still react with many substances. For example, iodine can turn a starch solution blue, which is a common method for testing iodine or starch. The reaction of iodine with metals can produce corresponding iodides, and the reaction with hydrogen requires a higher temperature and catalyst to generate hydrogen iodide.
All three have important uses in the chemical field, industrial production, medicine and other industries. However, due to their toxicity or corrosiveness, they should be handled with caution and follow safety procedures strictly.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty. It is a detailed and scientific account of all kinds of things. Salt, water, soil, etc. are used in various ways.
Salt, in people's diet, is an indispensable seasoning, which can add food flavor and enhance appetite. In ancient times, the importance of salt is not limited to this. It is an important source of tax revenue for the country and is related to the national economy and people's livelihood. In terms of food preservation, salt can prevent corrosion and keep food longer, such as curing meat, vegetables, etc., for emergencies. And in industry, it also has many uses, such as making alkali.
Water is the source of all things. In agriculture, irrigating farmland, nourishing crops, without water, crops will not be harvested. In ancient times, water conservancy projects were built, such as Dujiangyan, which diverted river water for irrigation and achieved a country of abundance. In life, people rely on water for drinking and washing. In industry, water is also an important medium. For example, in the process of papermaking, a large amount of water is required to soak and cook raw materials to separate fibers.
Soil, in agriculture, is the foundation for crop growth, and fertile soil breeds rich fruits. Different soil qualities are suitable for different crops. The ancients have been practicing this for a long time and were familiar with it. They planted it according to local conditions. In the field of construction, soil and water are mixed to form mud, which is used for building walls and firing earth bricks. It is also an important material for construction. And soil is indispensable for ceramic production. High-quality clay is shaped and fired into fine ceramic utensils, or used for life or as art treasures.
Salt, water, and soil, although ordinary things, were of great significance to the production and life of the ancients. The records of their uses in "Tiangong Kaiwu" provide precious materials for future generations to understand ancient technology and life.

If you want to make a mixture of water, fire, earth, wood, and gold, you must follow the ancient method and follow the principle of the five elements of mutual growth and suppression.
The water is the source of all things, soft and able to overcome rigidity. The method of getting water should be used in a clear place, like a clear spring in a deep mountain. Take the one that has not been polluted by the world. Use a purifier to fill it, and it can be used later.
The fire one can burn all things, and he can also become all things. The way to make fire can be used to fight with flints, or to drill wood to make fire. However, when you make a fire, you need to prepare dry wood and hay to help the fire. After the fire starts, you should protect it well so that it does not spread into a disaster.
The earth one carries all things. Soil should be taken in a place free from filth, and those with pure color and fine texture should be selected. Impurities in sand and gravel can be sifted out to make it pure for mixing.
Wood is full of vitality. Logging is selected as a good material, and it cannot be felled. Take the wood that is tough and straight, and cut it into a suitable shape so that it can be combined with other things.
Gold is hard and valuable. Cast gold needs to be melted at high temperature, so that the ore can be turned into gold water, and then poured into a mold to form.
As for the combination of these five, it should be based on soil and spread on the ground, and wood should be placed on it, and fire should be made on the wood. When the fire is booming, slowly fill water, and water will steam when it encounters fire, nourishing soil and wood. At this moment, pour the melted gold into it. The gold enters the water, fire, and earth, and is gradually merged by various forces.
When synthesizing, you need to be free of distractions and focus on it. And you need to grasp the opportunity, when to add water, when to add fire, and when to put gold. If the timing is not right, the mixture will not work. After many trials and familiarity with the nature of the five elements, you can successfully combine the mixture of water, fire, earth, wood, and gold, so that they can each develop their own capabilities and complement each other.

Mercury, water, grain, charcoal and other substances need careful attention during storage and transportation.
Mercury is a highly toxic liquid metal. When storing, a sealed container must be used to prevent it from evaporating in the air and causing poisoning. And it needs to be placed in a cool place, protected from heat and light, because the temperature will increase its volatilization. During transportation, it is necessary to ensure that the container is strong and free of leakage, and must strictly follow the regulations of dangerous goods transportation, equipped with corresponding protective and emergency equipment.
Water, although the source of life, is also careful when storing. Clean, non-toxic containers should be selected to prevent impurities and harmful substances from mixing in. If it is for long-term storage, attention should also be paid to regularly check the water quality to prevent it from deteriorating. When transporting, for a large amount of water, if it is transported by pipeline, ensure that the pipeline is intact and there is no leakage; if it is transported by vehicle or ship, the container should also be well sealed and prevented from being damaged by external impact.
For grain storage, it is advisable to choose a dry and ventilated place to prevent mildew and pests. High humidity can easily cause grain to germinate and rot, so it is often necessary to control the humidity of the storage environment. And it should be regularly turned over and inspected to detect and deal with problematic grains in time. When transporting, take moisture-proof and rain-proof measures to avoid moisture damage to the grain.
For charcoal, store it in a dry place, away from fire sources and flammable materials. Due to its flammability, it is easy to cause fire in the event of an open flame or high temperature. When transporting, attention should also be paid to fire prevention to ensure that the means of transportation are free from potential safety hazards, and to avoid mixing with flammable and explosive materials.
All of these, in the storage and transportation of all things, must be treated with caution, and follow the corresponding laws and regulations to ensure safety and not damage.