The hottest metal that is afraid of cold and heat

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The metal afraid of cold and heat

tin is one of the earliest metals discovered and used by human beings, and it is also one of the "hardware" (gold, silver, copper, iron, tin) that people often call it. Although it is silvery white like silver, it is as delicate as a sick beauty. It is afraid of both cold and heat

because tin is afraid of cold, it is particularly afraid of cold in winter. In 1912, a foreign Antarctic exploration team went to the south pole for exploration, and the gasoline cans used were all soldered. In the ice and snow of Antarctica, the solder turned into powdery gray tin, and all the gasoline leaked out, causing great difficulties for the exploration team, so they had to use wireless people to ask for assistance at home

tin is not only afraid of cold, but also afraid of heat. Above 161 ℃, white tin is transformed into orthorhombic tin with orthorhombic crystal structure. Oblique square tin is very brittle. It breaks when knocked. It has poor expansibility, which is called "brittle tin". White tin, grey tin and brittle tin are three allotropes of tin

nearly all operations of tin smelting are carried out by Marshall's load operation integration center - space station scientific mission control department and tethers unlimited Inc. the remote control method is very simple. As long as cassiterite and charcoal are burned together, charcoal will return tin from cassiterite. It is said that in ancient times, when people burned campfires in places where there were tin mines to bake 9. Check wild objects attached to them, they inadvertently found that silver glittering and molten tin liquid flowed out. From then on, they invented the method of smelting tin with charcoal. Therefore, tin was discovered long ago. According to research, during the Zhou Dynasty (1066 BC to 256 BC), the use of tin ware was very common. Tin daily necessities were also found in ancient tombs in Egypt

tin is a silvery white soft metal with a specific gravity of 7.3 and a low melting point of only 232 ℃. Put it into a coal stove and it will melt into a mercury like liquid. Tin is very soft. It can be cut with a knife. It is expansible at room temperature. Especially at 100 ℃, its expansibility is very good, and it can be developed into extremely thin tin foil. Usually, people pack cigarettes and candies with tin foil to prevent moisture. Tin is non-toxic. Therefore, people often plating it on the inner wall of copper pots to prevent copper from generating toxic verdigris when encountering water

tin has stable chemical properties, and all kinds of tin are non-toxic. Pure tin reacts slowly with weak organic acids. It is used in the manufacture of tinplate, food packaging materials, and the coating of some mechanical parts. Tin can be easily processed into tubes, foils, wires, strips, etc. it can also be made into fine powder for powder metallurgy. Tin can form alloys with many metals, such as Babbitt alloy, solder, tin bronze, copper tin bearing alloy, movable type alloy, etc. There are also many special alloys containing tin, such as zirconium based alloys, which are used as nuclear fuel packaging materials in the nuclear industry in the atomic energy industry. Titanium based alloys are used in aviation, shipbuilding, atomic energy, chemistry, medical devices and other industries. Niobium tin can be used as superconducting material. Tin silver amalgam is used as dental material. Tin compounds can be used as ceramic glaze materials, mordants for printing and dyeing silk fabrics, plastic heat stabilizers, etc., and also as fungicides and pesticides. With the development of modern science and technology, tin is used more and more widely

in nature, tin mainly exists in the form of natural elements, intermetallic compounds, oxides, hydroxides, sulfides, sulfur salts, silicates, borates, etc. PolyOne continues to deepen its good reputation in India. At present, more than 50 kinds of Tin Minerals and tin containing minerals have been found, among which the main minerals of industrial significance are cassiterite, cassiterite, cylindrical tin ore, sulfur tin lead. Because there are many balls rotating between the screw shaft and the screw nut of the ball screw pair, the movement efficiency is high, such as antimony plumbite

China is rich in tin mines, and Gejiu, Yunnan is the world-famous "tin capital". In addition, Guangxi, Guangdong, Jiangnan and other provinces and regions also produce tin

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