Lawmakers were called. Currently, it is defined by the weight of a platinum-based ingot called "Le Grand K" which is locked away in a safe in Paris. On Friday, representatives of more than 60 nations, gathered in Versailles, France, approved a new definition for the kilogram. The previous and 2019 definitions are given below. Kilogram definition, a unit of mass equal to 1,000 grams: the basic unit of mass in the International System of Units (SI). The BIPM distributed copies of each prototype to the signatory nations; the century-old U.S. national kilogram still sits in a glass case in a locked room down the hall from Pratt's lab. The new kilogram definition has come into effect now because May 20 is World Metrology Day, a day for celebrating the International System of Units. In 1889, the 1 st General Conference of Weights and Measures (GCPM) adopted the International Prototype Kilogram (IPK) as the definition for the unit, which has remained unchanged until now. Jon Pratt with the watt balance instrument at NIST. The motto of one of the system's creators, "for all times and for all people," is among Pratt's favorite phrases. Here's what that means. For further details of our complaints policy and to make a complaint please click this link: thesun.co.uk/editorial-complaints/, Comments are subject to our community guidelines, which can be viewed, This is a CGI image of the new kilogram prototype, The change isn't likely to affect most people in their everyday lives, new form of matter has been discovered by physicists and its not a solid, liquid or gas, experts reveal 100 metres of ice sheet thickness has vanished since the 90s, hot ice that can remain frozen at thousands of degrees of heat, Independent Press Standards Organisation (IPSO), The International System of Units is the standard modern form of measuring, The name of the system is often abbreviated to SI, The International System of Units encompasses seven base units, These base units are: metre (length), kilogram (mass), second (time), ampere (electric current), Kelvin (temperature), mole (quantity), and candela (brightness), This system is used in almost every country, Only Myanmar, Liberia, and the United States do not use SI as their official system of measurement but it is still commonly used for science and medicine purposes in these areas. News Corp is a network of leading companies in the worlds of diversified media, news, education, and information services. This article was originally published by The Washington Post. If the cylinder changed, even a little bit, then the entire global system of measurement had to change, too. And above it, in French, were the words that have guided metrologists since the beginning: A tous les temps, a tous les peuples. The definition of the kilogram just changed. You're right of course, the international prototype kilogram has a mass of 1kg, it's weight will vary depending on where in the world you are standing,(among other things) The world's standard definition of the kilogram, the ampere, the kelvin and the mole has been changed, after representatives from 60 countries voted to redefine the International System of Units (SI) for weight, current, temperature and amount of chemical substance. On Monday, May 20 — World Metrology Day — humanity will have a new definition of the kilogram, the standard unit of mass. And as the new definition is supposed to produce a result that was consistent with Le Grand K, the actual weight of a pound shouldn't change either. "It's such an optimistic view," Pratt said. THE DEFINITION of the kilogram has changed forever, 130 years after it was first established. Tomorrow, on 16 November, the General Conference on Weights and Measures ... France, and voted to change the definition of a kilogram, tying it to a universal constant in nature.
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