What is aluminum foil made of? Detailed answer

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What is aluminum foil made of? Detailed answer

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What is aluminum foil made of?

Aluminum is the metal most commonly found in the earth's crust: it makes up 7-8 percent of the earth's crust. But aluminum does not exist in nature in its pure form. It is in combination with other chemical elements, the composition of which is very difficult to decompose. The most important aluminum ore is bauxite, a type of clay. It contains 40 to 60 percent alumina. Aluminum has a number of qualities that make it useful for many products.

Aluminum is light, weighs three times less than metals such as iron, copper, nickel, zinc. Aluminum is a good conductor of electricity, as well as a good thermal conductor, so it is often used in technology in radiators of cooling systems. Aluminum resists corrosion: when exposed to air, it immediately reacts with oxygen to form a thin, durable, colorless film that protects the metal from further chemical attack, preventing corrosion. For these and other reasons, aluminum is used in the manufacture of foil.

Foil is a layer of any metal, about 0,127 mm thick or less. And in order to roll out metal to such a thickness, mechanisms with great accuracy are needed. Even the smallest changes in thickness stand out on the foil. Various types of rolling mills have been invented for rolling aluminum and other metals where precise thicknesses are required.

Aluminum is so malleable that it can be rolled into sheets of foil 0,005-0,008 mm thick. For this, pure aluminum is used. But mainly aluminum alloys are used for greater strength of the foil. In this case, other metals are combined with aluminum. Aluminum foil used in the home is resistant to moisture and gas, prevents grease, is odorless, tasteless, corrosion resistant, reflects heat, and does not transmit light.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What are lunar craters?

Craters are depressions on the surface of a cosmic body that have rounded outlines. The size of the craters is from 1 meter to 250 kilometers. Large and medium-sized craters on the Moon have been known since the first telescopic observations of this celestial body. They bear the names of famous scientists: Aristotle, Herodotus, Hipparchus, Copernicus, Kepler, etc.

Many large craters are surrounded by gently sloping ridges and have a flat bottom, in the middle of which a central hill rises. Others are in the form of funnels, which are formed during explosions. Numerous small craters cover the entire lunar surface and even the bottom and ramparts of large craters. Craters, even of an unusual shape, were formed when meteorites fell on the surface of the Moon.

Meteorites also owe their origin to the long bright rays that radiate from some large craters (for example, from the craters Tycho, Copernicus, Kepler) over distances of several hundred and even thousands of kilometers. They are chains of small craters covered with fine-grained matter that strongly scatters sunlight.

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Random news from the Archive

Coffee drinkers have a lower risk of early death 13.06.2022

A British study published in the Annals of Internal Medicine suggests that people who drink coffee, with or without sugar, have a lower risk of premature death. However, experts say, the results may be due to the fact that coffee drinkers are more affluent.

The study is based on data from over 171 participants in the UK BioBank, a long-term study that has collected data on the genetic, lifestyle and health information of over 000 people since 500, including details on participants' coffee drinking habits. Over seven years, those who drank 000 to 2006 cups of the drink a day without sugar had a 2,5% lower risk of death than those who didn't.

Previous research has shown that the drink may have health benefits, and drinking coffee is associated with a lower risk of diseases ranging from chronic liver disease to certain types of cancer and even dementia. In addition, the researchers observed a reduced risk of death among participants who drank 1,5 to 3,5 cups of sugar-sweetened coffee per day. The trend was less clear for people who consumed artificial sweeteners.

However, Navid Satar, professor of metabolic medicine at the University of Glasgow, who was not involved in the study, warns that although the results are intriguing, they are not unambiguous.

"The observational nature of this new study means that the conclusions are far from definitive," Satar said, adding: "This is because people who drink coffee are, in general, wealthier and lead healthier lives than those who don't drink." coffee, and I'm still not sure if these factors can be overcome in observational studies."

The professor advises to drink coffee and tea, preferably without sugar, and to maintain health in other ways - "move more, eat and sleep better."

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