Indium is the softest metal on earth. It is a rare metal formed by processing zinc ore and combining it with iron, lead and copper ore. It was discovered by German scientists Richter and Reich in 1863. of this metal. One interesting thing about indium is that when it bends, it makes a cry-like sound.

Features: White, soft material, conductive

Producing countries: China, Japan, South Korea

Uses: Indium is most commonly used in alloys in the semiconductor industry , solder and soft metal high vacuum seals and other products. During World War II it was used to coat aircraft engine bearings, but is now used to make relatively corrosion-resistant mirrors.

9. Silver

896.52 US dollars/kg (data: August 7, 2020)

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Metal Silver

We are all familiar with metallic silver. Silver naturally exists in agarwood mines and horny silver mines. It is a kind of gold that is smelted products formed. Silver has the best thermal and electrical conductivity and the lowest contact resistance of all metals. This means it is one of the most versatile precious metals.

Features: Silvery white, soft material, electrically and thermally conductive

Producing countries: China, Peru, Mexico and Chile

Uses: Its wide range of Uses include the most familiar in jewelry, coin making as well as photography, dentistry, batteries and circuits. Furthermore, it has many technical applications. Such as controlling odor and preventing the spread of bacteria, and everyone likes to buy jewelry made of silver because it is cheaper than gold, but has many of the same properties as gold. Silver is also used in the electronic components of ball mills.

8. Rhenium (Rhen use: Nickel-rhenium high-temperature alloys can be used to manufacture jet engine combustion chambers, turbine blades and exhaust nozzles. These alloys contain up to 6% rhenium. This is the largest practical application of rhenium. , Secondly, as a catalyst in the chemical industry, rhenium is more difficult to obtain than diamonds, so it is expensive. Since rhenium can be used in high-efficiency jet engines and rocket engines, it is very important in military strategy.

7. , Ruthenium

USD 8,680.70/kg (data: August 7, 2020)

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Metal ruthenium

Ruthenium is a member of the platinum group of metals and a rare transition metal. The content in the earth's crust is only one part per billion. Russia in 1844. Scientist Karl Ernst claus discovered this element at Kazan State University, and later gave it its Latin name after his hometown of Ruthenia

Characteristics: light gray, strong fire resistance, hard and brittle

Countries of production: Russia, North America, South America and Canada

Uses: Ruthenium is commonly used in electronics. It is cheaper than rhodium and has very similar properties. It is often used in electrical contacts, wires and Production of electrodes. It is also used as a catalyst in electrochemistry. Another new use is as a covering layer for extreme ultraviolet light masks.

6. Osmium

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Metal osmium

Osmium is a high-density rare metal and the highest-density metal in the world. This metal is extremely difficult to mine because its melting point is very high, reaching over 3,000 degrees.

Characteristics: Blue-silver, high melting point, hard and brittle

Country of production: Russia, North America, South America

Uses: Osmium has many different uses, but is most commonly used in hardening alloys , electrical contacts and filaments