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Transcript of ARGON
1.78.10 g.cm at 0 °C
Periodic Table Square
Discoverer: Sir William Ramsay and Lord Rayleigh
Place of discovery: UCL, London, England
Date of discovery: 1894
Origin of name : from the Greek word "argos" meaning "inactive".
Occurrence in Nature
The abundance of argon in the atmosphere is about 0.93 percent. It is also found in the Earth's crust to the extent of about 4 parts per million.
Argon was discovered by Lord Rayleigh and Sir William Ramsay in 1894. It was isolated by examination of the residue obtained by removing nitrogen, oxygen, carbon dioxide, and water from clean air. Air contains less than 1% argon. The atmosphere of Mars contains less than 2% argon. It was recognized by the characteristic lines in the red end of the spectrum.
Argon is produced industrially by the fractional distillation of liquid air in a cryogenic air separation unit; a process that separates liquid nitrogen, which boils at 77.3 K, from argon, which boils at 87.3 K, and liquid oxygen, which boils at 90.2 K. About 700,000 tonnes of argon are produced worldwide every year.
Although argon is non-toxic, it does not satisfy the body's need for oxygen. It is known to result in death due to asphyxiation. Argon is 39% more dense than air and is considered highly dangerous in closed areas. It is also difficult to detect because it is colorless, odorless, and tasteless.
It was the first noble gas to be discovered.
Important documents like the Declaration of Independence are stored in sealed, argon-filled glass cases to prevent decay.
Argon is not found in any compounds.
Argon is a colorless, odorless, and non-toxic material in all three of its states.
Argon is the third most abundant gas in the Earth's atmosphere.
The most exotic use of Argon is in the tires of luxurious cars. Every year world production produces 750.000 tones of Argon.