İngilizce-Türkçe-Almanca sözlük

1. iridyum. iridyum. iridyum. iridyum. (Ir) iridyum. iridyum. Ir sembolü ile bilnen atom no: 77 ve atom ağırlığı: 192.2 olan kimyasal element. iridyum.
2. iridyum.
3. metal iridyum.

Etymology : New Latin, from Latin irid-, iris; from the colors produced by its dissolving in hydrochloric acid
Pronunciation : i-'ri-dE-&m
Function : noun
Date : 1804

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1. precious metallic element of the platinum group (Chemistry); modern satellite communications system that enables mobile telephone communications everywhere in the world (Cellular Communication). iridium\i*rid"i*um\ , n. [nl., fr. l. iris, iridis, the rainbow. so called from the iridescence of some of its solutions. see: iris.] (chem.) a rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. with the exception of osmium, it is the heaviest substance known, its specific gravity being 22.
2. symbol ir. atomic weight 192.5.note: iridium usually occurs as a native alloy with osmium (iridosmine or osmiridium), which may occur alone or with platinum. iridium, as an alloy with platinum, is used in bushing the vents of heavy ordnance. it is also used for the points of gold pens, and in a finely powdered condition (iridium black), for painting porcelain black.
3. A rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents.
4. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4.
5. Symbol Ir.
6. Atomic weight 192.5. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.
7. a hard and very heavy metal that is combined with platinum to make jewellery and is used in scientific instruments. It is a chemical element : symbol Ir (iris ( IRIS); because when it becomes liquid in a particular acid, it shows the colors of the rainbow). Metallic chemical element, one of the transition elements, chemical symbol Ir, atomic number.
8.  A very rare, precious, silvery white, hard, brittle metal that resists most acids, it is one of the densest substances known on Earth. It probably does not occur uncombined in nature but is found in natural alloys with other noble (i.e., chemically inactive or inert) metals. The pure metal is too hard to work with to have any significant uses; alloys with platinum are used in jewelry, pen points, surgical pins and pivots, electrical contacts and sparking points, and extrusion dies. The international prototype kilogram, the primary standard (see: weights and measures) for weight, is made of an alloy comprising 90% platinum and 10% iridium. The discovery of abnormally high amounts of iridium in rocks dating to the boundary between the Cretaceous and Tertiary periods led to a much-debated hypothesis that an iridium-containing asteroid striking Earth led to a catastrophic chain of events including the extinction of dinosaurs and many other forms of life.