The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of-A-50% platinum and 50% iridiumB-60% platinum and 40% iridiumC-70% platinum and 30% iridiumD-80% platinum and 20% iridiumE-90% platinum and 10% iridium-E-90% platinum and 10% iridium

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E 90% platinum and 10% iridium The International Prototype Kilogram stored in a vault in Paris, was replaced by a formula using Planck&#39;s constant in 2019. The IPK was losing mass so the metrology community redefined the kilogram with the aid of the Planck constant. The IPK is a roughly golf ball sized object made of a platinum alloy known as Pt/&#39;10Ir , which is 90% platinum and 10% iridium (by mass) and is machined into a right circular cylinder with a height equal to its diameter of about 39 millimeters to reduce its surface area.

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The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of

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