Interesting facts about iron

Interesting facts about iron are a great opportunity to learn more about alloys. Today, iron (from Latin Ferrum) is one of the most popular metals in the world. In addition, it is found in the bodies of humans and animals.

So, here are the most interesting facts about iron.

iron bar

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What are some interesting facts about iron?

  1. In its modern form, iron is almost never used in its pure form. It is usually remelted with carbon to make steel or cast iron.
  2. In one form or another, it is present in most alloys.
  3. Iron is the second most abundant metal in the Earth’s crust, second only to aluminum.
  4. About 25 times more iron is mined on Earth per day than gold was mined during the history of mankind.
  5. If its carbon content is higher than 2.14%, you get cast iron, and if it is lower, you get steel. Iron will remain itself only if its carbon content does not exceed 0.8%.
  6. It is almost never found in its pure form. Iron ore usually contains a variety of impurities.
  7. The first iron tools and blades on Earth were made from iron meteorites found by our distant ancestors. Nobody yet knew how to mine and process iron ore.
  8. The corrosion rate of iron is directly affected by temperature and humidity. Heat and moisture quickly lead to rust.
  9. In pure oxygen, the metal burns very well.
  10. Fine iron powder may well ignite itself right out in the open air.
  11. Modern science believes that this metal makes up 80-90% of the Earth’s liquid inner core.
  12. Iron makes up a significant part of many asteroids. Apparently, it is very widespread in the Universe.
  13. In the distant past, when humans first learned how to work iron, it was worth more than gold.
  14. This metal is what canning jars are made of. They are simply coated with a thin layer of tin to keep them from rusting.
  15. Mercury is the second densest planet after Earth. This high density is due to the fact that most of Mercury’s core is iron.
  16. Rusted iron weighs more than pure iron, because rust (iron oxide) is heavier than this metal in its pure state.
  17. It is iron that ranks first in the world in terms of annual production among all minerals.
  18. Back in the Middle Ages, it was used to make not only weapons and armor, but also jewelry.
  19. The Kursk Magnetic Anomaly covers an area of 120,000 km², which is more than most countries in Europe. It is the largest iron ore deposit on Earth, with proven reserves of about 55 billion tons.
  20. When heated to 1,538 °C, iron changes to a liquid aggregate state, and at 2,862 °C it evaporates.
  21. It is what gives our blood its red color. It is iron oxide that transports oxygen through blood. This is why some mollusks have blue blood, because they use copper to carry oxygen.
  22. The soil of the planet Mars is very rich in iron oxide, that is simply rust, which is why it has such a red-brown color.
  23. About 4.65% of the mass of the Earth’s crust accounts for this metal.
  24. On average, the body of a normal adult has about 5 grams of iron at any given time. It is present not only in the blood, but also in some other organs.
  25. In the Middle Ages in Europe, only the nobility had the right to wear iron jewelry. They were even more expensive than silver or gold.
  26. Iron ore can contain up to 300 other minerals in the form of impurities. Absolutely pure iron ore is extremely rare, and such deposits are very highly valued.
  27. The largest single piece of iron ever discovered is the Goba meteorite, about 9 m³ in volume and weighing 66 tons. It fell in what is now Namibia during the time of primitive people, and it was not discovered until 1920.
  28. Iron dissolves without residue in sulfuric and nitric acids.
  29. Deposits of iron nuggets without any impurities were found only in Greenland. The ore there is of excellent quality, but the deposits themselves are small.
  30. The content of this metal in sea water is 100-1000 times less than in fresh water, i.e. in rivers or lakes.
  31. Magnetized piece of iron loses its properties when heated to a high temperature, and they do not return to it after cooling. But it can be magnetized again.
  32. Lack of iron in the human body leads to anemia, weakness, hair and nail loss.
  33. There is the Taylor Glacier in Antarctica, and on it is the famous Bloody Falls. Its water is reddish-brown, and that’s because it has a very high iron oxide content.


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