International Prototype of the Kilogram
id:
international-prototype-of-the-kilogram-207-2088960
title:
International Prototype of the Kilogram
text:
The International Prototype of the Kilogram is an object whose mass was used to define the kilogram from 1889, when it replaced the Kilogramme des Archives, until 2019, when it was replaced by a new definition of the kilogram based entirely on physical constants. During that time, the IPK and its duplicates were used to calibrate all other kilogram mass standards on Earth. The IPK is a roughly golfball-sized object made of a platinum–iridium alloy known as "Pt‑10Ir", which is 90% platinum and 10
brand slug:
wiki
category slug:
encyclopedia
description:
Physical artifact that formerly defined the kilogram
original url:
https://en.wikipedia.org/wiki/International_Prototype_of_the_Kilogram
date created:
2009-08-02T17:55:35Z
date modified:
2024-09-10T21:59:48Z
main entity:
{"identifier":"Q3738063","url":"https://www.wikidata.org/entity/Q3738063"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/e/e1/International_prototype_of_the_kilogram_aka_Le_Grand_K.jpg","width":1217,"height":1512}
fields total:
13
integrity:
16