The U.S. National Institute of Standards and Technology called this Friday a “turning point for humanity,” even though the difference between this day and the day before weighs, theoretically, nothing at all. But, while something that weighs a kilogram — the basic unit of mass — is just as heavy as it was before, the way that kilogram is defined has changed, after a vote by scientists at the General Conference on Weights and Measures in Paris. For 130 years, the kilogram has been defined as the exact weight of a cylinder of platinum-iridium held in a triple-locked vault in Paris.
The Definition Of A Kilogram Just Changed. That’s A Major Milestone In The Grand History Of The Metric System
George Steer, Time
Fri, 11/16/2018 - 1:23pm
Topics: u.s national institute standards technology general conference metrologists international prototype k ipk others k it french national assembly the assembly north pole treaty meter sèvres france k time history since le grand k either le grand k read long tortuous history metric system earth&rsquo k k this martin milton international bureau measures bipm today barry inglis director bipm in in u.s weights measures paris k ipk le grand bipm changed mass measurement world current fundamental force units natural weighs constants distance scientific years countries micrograms replicas unit foundation important born microwave light friday scientists science amount called radiation cesium terms energy set means century liter kibble electric decided electrical based objects planck constant
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