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 History of the discovery of argon used in light bulbs

2018-01-31 11:07:27

argon used in light bulbs
argon used in light bulbs
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argon used in light bulbs
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 History of the discovery of argon used in light bulbs
A rare gas of argon. argon used in light bulbs, arc welding (cutting) stainless steel, magnesium, aluminum, and other alloy shielding gas. Also used in smelting of steel, aluminum, titanium and zirconium. Argon discharge purple glow, but also for lighting technology and filling fluorescent lamps, photocell, lighting tubes. During the brewing process, the fillings in the beer barrel displace oxygen to prevent the raw material in the beer barrel from being oxidized to acetic acid. Heat treatment process is also used to replace nitrogen and ammonia, the effect is more than nitrogen and ammonia, stainless steel heat treatment using argon to protect the bending effect is better not easy to break.
Henry Cavendish Argon was prepared by Henry Cavendish in 1785 but did not find it a new element; until 1894, John William Strath and chemists in Scotland William Ramsay was determined experimentally argon is a new element. The main reason they compare nitrogen, which was obtained after removing oxygen, carbon dioxide, water vapor, etc. from air samples and nitrogen that is decomposed from ammonia, was found to be 1.5% lighter than nitrogen from air. Although this difference is small, it is out of the scope of the error. So they think that the air should contain an unknown new gas, and that the new gas is argon.
In addition, in 1882, H.F. Newell and W.N. Hartley observed the color spectrum of air from two independent experiments and found that there was a spectrum in the spectrum that could not be explained by the spectrum of the known element, but did not realize it was argon. Argon has the symbol Ar (before 1957, its symbol A).

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