3 Pyridinol 2 Iodo

On a certain day, a guest asked me: "What are the physical properties of its throwing?" I wrote an ancient saying to answer it.
The objects thrown by the husband, looking at their shape, are mostly round, with a smooth surface without edges. Its diameter is about a few inches, and the size is moderate, which is easy to hold and throw. The material is also often cast in copper, which is firm and heavy, with cool tentacles and a metallic texture. Its color is bright yellow, like the golden light of autumn, rubbed by the years, or mottled with green rust, but it does not reduce its quaint charm.
As for its properties, it has toughness and can withstand constant throwing without damage. Due to gravity, if you throw something on the ground, it will roll down with the trend, and its trajectory will vary depending on the direction of the force and the shape of the ground. If you are in a flat and wide place, you must roll in a straight line or arc, and the speed will gradually slow down until it is still. And its texture is dense, the sound is crisp, and when it falls on the real place, there will be a sound of "clang", and the sound will be transmitted near and far, and it can be clearly heard.
Furthermore, when throwing something, depending on the size and angle of the force, its flying state is different. If the force is large and flat, you will travel far and fast; if the force is small and raised, you will travel high and close. This is all in line with the laws of physics. Although it has not been carefully observed by today's science, it can be felt between daily playing and throwing. Looking at the physical properties of this throw, although it is an ordinary thing, it also contains the wonders of natural creation, which will be understood by those who have the heart to observe it carefully.

Mercury, commonly known as mercury, has different properties and many chemical characteristics.
Mercury is in the shape of a liquid at room temperature, and the silver optical flow is like a smart silver water. This is its significant external characteristic. Its melting point is extremely low, only -38.87 ° C, so it is very easy to convert from solid to liquid; and the boiling point is not very high, about 356.6 ° C, and it is easy to vaporize into mercury vapor when heated.
Mercury has a unique chemical activity. Although it is difficult to replace with dilute hydrochloric acid and dilute sulfuric acid, it can react violently with oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid. When co-heated with concentrated sulfuric acid, mercury is oxidized to mercury ions, and sulfuric acid is reduced to form sulfur dioxide gas, mercury sulfate and water; when it encounters concentrated nitric acid, mercury quickly reacts with it to form mercury nitrate, nitrogen dioxide and water, and the reaction is intense. The reddish-brown nitrogen dioxide gas gushes out.
Mercury can also be affinity with a variety of metals to form amalgams. If mercury and aluminum are mixed, the two can form aluminum amalgams. The formation of aluminum amalgam destroys the oxide film on the surface of aluminum. Aluminum continues to react with oxygen in the air to form white aluminum oxide, and the reaction process is like growing a white "brush", which is quite strange.
Furthermore, mercury and its compounds are many toxic. Inhalation of mercury vapor into the human body can cause serious damage to the nervous system, digestive system, etc. After mercury ions enter the human body, they will combine with thiol groups in proteins, causing protein denaturation and interfering with normal physiological functions of the human body. Therefore, when using mercury, it is necessary to be cautious to prevent the risk of poisoning.

"Tiangong Kaiwu" says: "It is jujube, chestnut, hazel, and pine, which can only be used for grain food, not for regular meals." The use of food has its own advantages. As far as meat is concerned, its main purpose is to facilitate storage. In ancient times, there was no method of refrigeration as it is today. Fresh meat is difficult to store for a long time, and it is easy to perish and deteriorate. The meat is made into dried meat, and through processes such as pickling and drying, it can remove its moisture, reduce the possibility of microbial growth, and can be stored for a long time to prepare for emergencies. If you march for battle, the journey is long, and the supply is inconvenient. The dried meat is light and easy to carry. It can be used as dry food for soldiers to protect their physical strength and maintain the needs of the march.
Furthermore, the dried meat has a unique flavor and can be made into delicious food. The meat is marinated with seasonings, which is spicy and delicious, salty or sweet, and has a rich taste. In daily diet, it adds a different flavor to the table, and it is a good choice to serve with wine. When relatives and friends gather, they treat each other with dried meat, which is also a good treat and adds to the pleasure of eating.
In addition, dried meat can also be used as a gift. Because of its fine production, convenient preservation, and light portability, it is given to others in interpersonal communication to express their sincerity. During festive celebrations, the gift of dried meat is both practical and decent, conveying friendship and enhancing the harmony of interpersonal relationships.

To combine the two things into one thing, there are many methods, each with its own wonders, which can be seen in the book "Tiangong Kaiwu".
One is the method of fusion. If you take metals as an example, put the metals you need to fuse into a furnace and calcine them with a hot fire. The furnace is full of flames and the temperature is extremely high, which can make the metal into a flowing liquid. When the metals are all liquid, stir them evenly, and then let them stand and cool. In this way, different metals are fused into one. For example, when a sword is cast, iron is often fused with other metals to make the texture of the sword more tough. This is the power of high temperature to break the solid state of the metal, so that the molecules can be fused with each other, and after cooling, they will become one.
The second is the method of gluing. There are many sticky things in the world that can be used to glue two things. For example, woodworking, wood is often glued with glue paint. Apply the glue paint evenly to the surface of the wood to be glued, and then press it tightly. After the glue paint dries, the wood can be firmly connected. The stickiness of the glue paint can fill the tiny pores on the surface of the wood, so that the two are closely attached, as if one. When making a bow, use animal tendons to glue with wood to make the bow both elastic and tough.
The third is the method of sewing. For materials such as fabric or leather, sewing is a commonly used method of combining two into one. Use needle and thread to thread through and sew two pieces of fabric or leather repeatedly. There are also many kinds of stitching methods for sewing, such as flat needles, hemming needles, etc. The sewing can not only connect the materials, but also the density of the stitches and the difference in the stitching method can affect the firmness and appearance of the whole. Such as sewing clothes, careful sewing can make the clothes fit and durable.
The fourth is the method of tenon and mortise. This is a delicate skill of woodworking and is widely used in wood construction. First, the tenon and mortise are made on the wood. The tenon and mortise are protruding and the mortise is concave. The tenon and mortise are precisely embedded in the mortise, and the two fit each other and fit tightly. The mortise and tenon structure does not need to be riveted, and only the concave and convex fit of the wood itself can make the components closely connected and have good stability. For example, the beams and columns of ancient buildings are mostly connected by mortise and tenon, and they still stand tall after years of wind and rain.
These several ways of combining into one are the crystallization of the wisdom of the ancients, playing an important role in all walks of life, making the best use of things and creating many exquisite utensils.

When casting and transportation, there are many key things to pay attention to.
When casting, the first material. If the material is not good, it will be difficult to make the tool. Select the material when fine, check its texture and purity, and do not let impurities mix in. This is the foundation of the casting tool. If you cast a tripod, the ratio of bronze needs to be accurate, and the amount of tin and lead is related to the hardness and toughness of the tripod. If the ratio is improper, it will be brittle or soft, and it will be unbearable to use.
The heat is also very important. If the fire is fierce, the material will be easy to burn, and if the fire is weak, the material will be difficult to melt. Looking at the heat requires experience, depending on the color of the flame and the Such as casting a sword, it needs to be quenched many times, and it needs to enter the water at the right temperature, so that the sharpness of the sword can be achieved. If the fire is too strong, the sword body will crack easily; if the fire is insufficient, the sword will have no edge.
The casting system should not be sloppy. The accuracy of the shape is related to the shape of the tool. The material and structure of the fan should be suitable, and the production should be fine. The gaps should be tightly closed, otherwise the copper liquid will leak easily during casting, resulting in incomplete leakage of the utensils.
When transporting, protection comes first. The utensils are ready, most of them are precious, and they are bumpy and vulnerable on the way. It needs to be wrapped in soft objects, such as silk and hay, to slow down the vibration. There is also attention to placement, and it
The road of driving should also be chosen carefully. Avoid rough roads and choose a flat road to reduce vibration. And the speed of driving should not be too fast to prevent the collision and damage of the utensils caused by sudden braking.
The people who travel with you need to be taken care of by a special person. Pay careful attention all the way, smell strange sounds, quickly check the condition of the utensils, and ensure that the casting and transportation are correct, so that the utensils can be intact and passed on to future generations.