How much gold is in an Olympic gold medal? Detailed answer

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How much gold is in an Olympic gold medal? Detailed answer

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How much gold is in an Olympic gold medal?

According to the recommendations of the International Olympic Committee, Olympic gold medals must contain at least 6 grams of pure gold in the form of application. As a rule, the organizers of the Games do not increase this figure, so the gold medal in the physical sense is mostly silver. So, in the medals of the highest standard of the London Olympics-2012, the gold content is slightly more than 1%.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What does it take to make glass?

At first glance, glass appears to be made from a mixture of very specific chemicals, in a complex way, and is a marvel of chemistry. But in reality, glass is made in a very simple way, using the most ordinary substances.

Glass is an alloy of certain materials, cooling this mixture so that the atoms organize themselves randomly. What materials? About 95% of the Earth's minerals can be used in the production of glass! The most important of them are: sand (silicon dioxide), soda, limestone, borax, boric acid, magnesium oxide, lead oxide. Nature itself created the first glass.

About 450 years ago, molten rock from the bowels of the Earth rushed to the surface and broke through the earth's crust with volcanoes. When the hot lava contained silicon dioxide and rapidly solidified, a glass formed as hard as rock. Volcanic glass is called obsidian.

Man has been making glass since ancient times. The Egyptians more than 5000 years ago knew the method of making colored glass, with which they covered stone, dishes, and sometimes made beads. Perfume and ointment bottles made of glass were used in Egypt over 3500 years ago.

The period of the Roman Empire (XNUMXst century BC - XNUMXth century AD) was one of the greatest periods in the history of glass. It was at this time that man mastered how to blow glass and how to shape and size glass objects.

Today, of course, there are many new ways of producing glass. But this is the main process. Raw materials for glass enter the glass factory and are stored in huge tanks. Substances are carefully measured, dosed and mixed. Broken glass, similar to that produced and called "cullet", is added to the mixture to speed up melting. The mixture is automatically fed into the oven. The glass then flows out of the oven to cool. It then goes through numerous processing processes such as blowing, pressing, rolling, casting and painting, depending on the type of glass to be obtained.

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mushroom exchange 22.06.2016

Trees redistribute the products of photosynthesis throughout the forest.

The fact that some plants are friends with each other, while others cannot stand the neighborhood, is known to many gardeners. What is the matter here, it is not clear; usually indicate the release of some volatile substances. Perhaps, in fact, you need to look at the root, which was done by researchers from the University of Basel, led by Professor Tamir Klein. They studied the redistribution of carbon between trees in a forest.

At the height of the crown of old - 120-year-old - firs, networks of thin tubules were stretched. Carbon dioxide, purified from the heavy isotope C13, was supplied through them, and using an atomic mass spectrometer, it was possible to trace the path of carbon after the plant had utilized it as a result of photosynthesis. This path turned out to be strange: soon enough, traces of such depleted carbon appeared in the roots not only of the experimental tree, but also of its neighbors, including birches, pines and larches.

The volume of carbon pumped was significant - up to 40% content in thin roots or 250 kg of interchange of substances per hectare of plantings per year. It is obvious that carbon did not travel by itself, but as part of some compounds. Only mushrooms could help him in this, the mycelium of which entangles the roots of plants. But each plant has its own companion mushrooms. This means that the forest community is an integral system, between the parts of which there is a very dynamic exchange of substances.

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