Helium - Tales from the Periodic Table
Автор: Ron Hipschman
Загружено: 2023-05-15
Просмотров: 6834
Описание: Helium is the second element in the periodic table, and the 2nd most abundant element in the universe. For the most part, it was created 13.8 billion years ago 3 minutes after the Big Bang, though today it continues to be created by the fusion of Hydrogen in the cores of stars and by radioactive decay in the crust of the Earth. Helium is a "noble" gas, and does not naturally form chemical compounds. It's a non-renewable resource that we must explore for, and extract from the ground. Helium's density is low enough that it's used to lift air ships. It's boiling point is so low, only 4 degrees above absolute zero, it's used to cool instruments, like your MRI machine, to temperatures near absolute zero. It's also used to weld metal in an inert atmosphere to prevent oxidation.
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