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Winged words, phraseological units. Meaning, history of origin, examples of use
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Egyptian darkness
Bible
Phraseologism: Egyptian darkness.
Meaning: Thick, impenetrable darkness.
Origin: An expression from the Bible about one of the miracles that Moses performed: he "stretched out his hand to heaven, and there was thick darkness over all the land of Egypt for three days" (Exodus, 10:22). "- Yes, and the night turned out. Egyptian darkness, God forgive me!" (V. G. Korolenko, Killer, 2.)
Random phraseology:
Almighty dollar.
Meaning:
The power and strength of money.
Origin:
An expression from the essay "Creole Village" (1837) by the American writer Washington Irving (1783-1859), which was preceded by the "almighty gold" found in Ben Johnson (1573-1637) (in "Message to Count Elizabeth Rutland"). |
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| Random news from the Archive Metal foam - thermal insulator
21.03.2022
Scientists from the University of North Carolina (USA) have developed a lightweight metal foam that is able to insulate heat more efficiently than conventional metals and alloys.
Composite metal foam consists of hollow spheres of carbon or stainless steel or titanium embedded in a metal matrix.
The presence of air pockets allows such foam to effectively block heat, since heat spreads through air more slowly than through metal.
Americans have learned to make composite foam in two ways. The first technology is based on casting materials with a low melting point (aluminum) around hollow metal spheres made of materials with a high melting point (steel). The second technology is based on the sintering of metal powder around finished hollow spheres.
During the tests, foam samples measuring 6 x 6 centimeters and a thickness of about 1,8 centimeters were exposed to fire for half an hour and measured how long it would take for the heat to reach the opposite edge.
It turned out that a piece of stainless steel heats up to 800 C in 4 minutes, but a similar-sized sample of metal foam holds heat twice as long - 8 minutes.
Composite metal foam can be used to store and transport temperature sensitive materials, explosives and radioactive materials.
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