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An alloy of [[platinum]] and iridium was used in the international standard [[International_System_of_Units#Meter|meter]] bar, before the standard was changed in 1960. A similar alloy is still used in the international standard [[International_System_of_Units#Kilogram|kilogram]]. An alloy of 90% [[platinum]] and 10% iridium is widely used in both the jewelry and chemical industries, because it is strong, hard, beautiful, and impervious to almost all chemicals even at very high temperatures.
An alloy of [[platinum]] and iridium was used in the international standard [[International_System_of_Units#Meter|meter]] bar, before the standard was changed in 1960. A similar alloy is still used in the international standard [[International_System_of_Units#Kilogram|kilogram]]. An alloy of 90% [[platinum]] and 10% iridium is widely used in both the jewelry and chemical industries, because it is strong, hard, beautiful, and impervious to almost all chemicals even at very high temperatures.
A layer of iridium in certain rocks, found all over the world, is part of the evidence implying that an asteroid strike caused the [[Cretaceous-Tertiary Mass Extinction]].
== Uses ==
== Uses ==