Iridium

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Wikipedia

Irídium je chemický prvok v Periodickej tabuľke prvkov, ktorý má značku Ir a protónové číslo 77. Často sa mu hovorí aj „vesmírny prvok“, lebo na Zemi sa nachádza prevažne v meteoritoch. Tento prvok je vďaka svojej mimoriadnej chemickej odolnosti legovaný do zliatin s ródiom a platinou, ktoré sa používajú na výrobu odolných chemických nádob na rozklady vzoriek tavením alebo spaľovaním za vysokých teplôt. Ide v poradí o druhý prvok s najväčšou hustotou. V sklárskom priemysle slúžia tieto zliatiny ako materiál do špeciálnych pecí na ťahanie optických vlákien. Prvotné medzinárodné etalóny dĺžkovej miery 1 m a hmotnosti 1 kg boli vyrobené zo zliatiny platiny s irídiom.

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4 articles first seen 01.02.2026 last seen 13.08.2026

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