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Mercury has many physical properties.
The normal state of mercury is liquid, which is unique among metals. Most metals exist in a solid state and melt into liquid when heated. However, mercury is in a flowing state at room temperature, just like smart water, so it is also known as "mercury". Its texture is smooth, it feels cold but not icy, and it rolls like a bead when shaken lightly, with a dazzling luster and a shimmering silver-white brilliance.
The density of mercury is quite high, far exceeding that of ordinary liquids. Placing mercury in a container makes it feel heavy. If you put something else into a mercury solution, the lighter one floats on it, and the heavier one sinks, because of its density. This property also makes it useful in certain measurement tradeoffs.
Furthermore, the boiling point of mercury is relatively low, about 357 degrees Celsius. Heating the mercury solution does not require extreme heat, and it quickly turns into curling mercury vapor. This vapor is colorless and invisible, but it is toxic and cannot be ignored. The freezing point of mercury is minus 38 degrees Celsius. In extreme cold conditions, it condenses into a solid state. However, solid mercury is as hard as a metal and retains its silvery white color.
Mercury also has good electrical conductivity, although it is slightly inferior to metals such as copper and silver, it is rare among liquid conductors. It is also used in many fields such as circuit conduction and electrical instrumentation.
Mercury is unique and distinct in physical properties. It has both liquid agility and metal characteristics. However, its toxicity also adds a bit of danger to it, so it should be used with caution.

Mercury is one of the metals. It is liquid at room temperature, shiny with silver, and flows freely. It is like smart water, so it is also known as "mercury". It has many unique chemical properties, which are described here.
The chemical properties of mercury are relatively stable, and it is difficult to combine with oxygen at room temperature. However, when heated to a specific temperature, it can closely combine with oxygen to form mercury oxide. This change is like a hidden dancer. At the right opportunity, it can show its unique posture. Looking at the reaction formula: 2Hg + O < 3 $\ stackrel {\ Delta }{=\!=\!=}$ 2Hg O, under heating conditions, mercury and oxygen dance together to form mercury oxide, and its color is bright red, like the spirit of flame.
Mercury can be rapidly combined with sulfur, and this reaction is like a thunder triggering the fire of the earth, which is very rapid. When the two meet, mercury sulfide is instantly formed, and its color is black. After sublimation, it can be turned into cinnabar, which is bright red and is very precious in the field of alchemy and pigments. The reaction formula is: Hg + S = HgS. This reaction is like a magical magic. In an instant, the material changes, which is amazing.
When mercury encounters strong acids, such as sulfuric acid and hydrochloric acid, if there are no special conditions, it is difficult for the two to react, just like two trajectories that never intersect. When it encounters nitric acid, mercury seems to be ignited by a fuse and reacts violently with it. When it interacts with dilute nitric acid, mercury nitrate, nitric oxide and water are formed; when it meets concentrated nitric acid, the product is mercury nitrate, nitrogen dioxide and water. Looking at the reaction formula with dilute nitric acid: 3Hg + 8HNO (dilute) = 3Hg (NO) (dilute) + 2NO ↑ + 4H 2O O; when it reacts with concentrated nitric acid: Hg + 4HNO (concentrated) = Hg (NO) (concentrated) (concentrated) = Hg (NO) (concentrated) (heavy) + 2NO (low) ↑ + 2H (low) O. This change is like a mysterious drama, the plot is ups and downs, and the plot is fascinating.
Mercury compounds also have their own wonderful properties. Mercury oxide can be decomposed by heat and re-converted into mercury and oxygen, just like a butterfly that breaks a cocoon and is reborn. Mercury chloride is extremely toxic, but in the field of chemical analysis, it has its unique uses, like a rose with thorns, beautiful but dangerous. Mercury sulfide is very useful in pigments, medicine and many other aspects because of its stability.
The chemical properties of mercury are unique and complex. On the stage of chemistry, it interprets a wonderful chapter, attracting countless seekers to study it.

If you want to combine the two flavors as a medicine, there are many methods, each with its own reasons, and they are all applied according to the nature of the medicine and the disease.
If you have a whisker, the nature of the two medicines is similar, and if you use them together, the effects will be similar and enhanced. Such as ephedra and cinnamon branch, ephedra is good at opening the mechanism and dissipating wind and cold. Cinnamon branch can relieve muscle expression and help yang and qi. The two are used together. The power of sweating and relieving the surface is greatly increased, and it can remove the evil wind and cold on the surface.
There is a messenger, one medicine is the main one, and the other medicine is the auxiliary one. The auxiliary medicine can help the main medicine increase the effect. If astragalus invigorates qi and raises yang as king, while cohosh and bupleurum can lead to the rise of clear yang qi, and help astragalus to lift the sunken yang qi. This is an example of compatibility, which is beneficial for the syndrome of middle qi depression.
There are also people who are afraid of each other. The toxicity of one medicine can be inhibited by another medicine. For example, Banxia fear ginger, ginger can make Banxia toxicity, and the two are compatible. It not only uses Banxia dryness to reduce phlegm, reduce the power of anti-vomiting, but also reduce its toxicity. It is often used for phlegm drinking and vomiting.
For people who kill each other, in contrast to Xiangwei, one medicine can eliminate the toxicity of another medicine. If mung bean kills croton poison, if it is poisoned by accidental ingestion of croton, mung bean can be used to solve it, which is an emergency detoxification method.
There are also evil people, the two drugs are used together, and one medicine can reduce or even lose the efficacy of the other medicine. Such as ginseng and radish seed, radish seed moves qi and breaks qi, which is contrary to the power of ginseng to replenish qi. If the two are used together, the power of ginseng to replenish qi will be weakened, and it should be avoided when it is diagnosed.
On the contrary, the combination of the two medicines will produce severe toxic and side effects. Such as aconite anti-banxia, melon, fritillary, white beetle, white and, these compatibility, must not be used, so as not to endanger life.
The method of combining drugs must carefully examine the taste, efficacy, and compatibility of drugs, and treat them through syndrome differentiation. It is also the important task of the doctor to combine drugs with diseases and avoid harm.

The main uses of alum as mentioned in "Tiangong Kaiwu" are generally three.
One is for dyeing. The matter of dyeing was the key to the textile industry in ancient times. Alum can be used as a mordant in it. When the fabric is dyed, it is first treated with alum liquid. The metal ions in the alum can be combined with the fabric fibers, and then chemically react with the dye, so that the dye can adhere more firmly to the fabric, making the dyeing effect longer lasting and more vivid. For example, when dyeing cloth, the craftsmen in the dyeing workshop often use alum skillfully, so that the color of the dyed fabric can be rubbed and washed over the years, and it is still not easy to fade, adding color to the daily clothing of the people and all kinds of fabrics.
Second, it is used in papermaking. The papermaking process is complicated, and alum also has a wonderful use in it In the process of pulp preparation, adding an appropriate amount of alum can change the properties of the pulp, making the paper more regular and tighter in texture. At the same time, alum can enhance the water resistance of the paper and reduce the absorption of water by the paper. In this way, the paper produced is not easy to spread ink when writing, and can better carry pen and ink. Whether it is a scholar splashing ink to create calligraphy and painting, or official documents and records, etc., all rely on this characteristic, which greatly improves the quality and practicality of the paper.
Third, it is used in food processing. In some traditional food production, alum also plays an important role. For example, when making fried pasta such as fried dough sticks, adding a little alum can react with other ingredients to produce carbon dioxide gas, which makes the pasta expand rapidly during the frying process, forming a fluffy and crispy taste, which is much loved by the public. However, it is also necessary to control the dosage when using, and excessive use may be detrimental to human health.
To sum up, alum has important uses in dyeing, papermaking, food processing and other fields, playing an important role in the development of many industries in ancient times and the improvement of people's quality of life.

It is necessary to be careful when storing and transporting things. When hiding things, the first place is the place. Choose a high and dry place to prevent moisture from invading it and causing the things to rot. As "Tiangong Kaiwu" said, every grain of wheat and sorghum should be hidden in a warehouse. The warehouse must be built high on the foundation, off the ground, and ventilated all around, so that it can be stored for a long time without damage.
Also pay attention to the infestation of insects and rats. Where things are hidden, their holes must be strictly blocked, or bait must be placed to prevent them. In the past, people hid grain and often distributed lime, cypress leaves, etc. in the warehouse, and insects and rats were afraid to stay away.
As for transporting things, the danger of the road and the cold and heat of the time are all things to worry about. If you are transporting fragile things, you must add protection and wrap them in soft things to prevent them from being bumpy and broken. If you are transporting porcelain, you should often wrap them in layers of straw and cotton wool and place them in a safe place.
When transporting goods by boat, you should observe the water trend. The water is rising and rushing, so it is advisable to move slowly to avoid the whirlpool reef; the water is dry and shallow, so you may not leave them on the beach, and you need to check the depth of the waterway. If you are transporting by land, you should also consider the strength of mules and horses, and slow down heavy loads to avoid damage caused by tired animals.
When transporting goods, the integrity of people is also the key. The escort should abide by his responsibilities and should not steal and sell. In the past, when merchants transported goods, they often chose loyal and reliable people to escort them to ensure the safety of the goods.
Treasures and transportation are related to the complete destruction of things. Everything is subtle, and you must be careful to be worry-free.