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Argon is a colourless, odourless, inert noble gas denser than air. Named after the Greek word argos, which means “inactive”, it is obtained by distilling atmospheric air.
In industry, it is used as a shielding agent for metal welding (GTAW welding) or in mixtures with other gases (GMAW welding). Argon is also used in modified-atmosphere food packaging and oenology.
In healthcare, its applications include excimer lasers (ophthalmology) and as a treatment method in digestive endoscopy, because argon combined with an electric current can coagulate bleeding injuries from the mucous membrane of the intestinal tract. It is also used in analytic laboratories for chromatography.
Argon has other curious applications:
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