Kilogram Cylinder facts
While investigating facts about Density Of Kilogram Cylinder and The Standard Kilogram Is A Platinum-iridium Cylinder 39, I found out little known, but curios details like:
The kilogram is currently defined as the mass of a platinum-iridium cylinder called the International Prototype Kilogram, which was made in 1879 and is stored in a special vault in France. There exist several dozen official replicas, also called prototypes.
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The kilogram is the only unit of measurement that is still based in a physical object, a Platinum-Iridium cylinder.
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The kilogram is still officially defined by a platinum-iridium cylinder made in 1879.
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There's a metal cylinder kept in a French vault which sets the standard weight of a kilogram.
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The standard used to represent a kilogram is a cylinder of platinum-iridium alloy stored in France
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Since 1875, the exact weight of a kilogram has been defined by the International Prototype of the Kilogram, a cylinder that sits locked in an environmentally regulated vault outside Paris. Every 40 years, it's removed and compared to a half-dozen copies around the world
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About The Kilogram which is a cylinder of metal which is what the measurement of weight was based off of
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Until recently, the kilogram was defined by the "International Prototype Kilogram" (IPK) , a platinum-alloy cylinder made in 1889. From May 2019, a Kibble balance was used to link it to Planck's constant (because the weight of the IPK was changing subtly over time).
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Until TODAY 1 kilogram was defined by "the big K", an iridium platinum cylinder conserved in France
