The Kilogram Redefined After 130 Years


More than 60 representatives of countries from around the world voted to do away with the old system of measuring the kilogram at the 26th General Conference on Weights and Measurements in Versailles, France. According to reports, up until now, every measurement
of mass that has been made on Earth has been linked to this one cylindrical object called Le Grand K, which is an international prototype kilogram. This palm-sized metal cylinder is hidden in a vault outside Paris and is vacuum sealed under three bell jars. But from May 20, 2019, the kilogram will no longer be tied to the Le Grand K; instead, it will be defined by a fundamental constant of nature known as the
Planck’s constant. Along with the kilogram, other units of the metric system that have been redefined include the ampere (unit of electric current), the kelvin (unit of temperature) and the mole (unit of substance). The value of the Planck’s constant has been fixed at exactly 6.62607015 × 10−34 kilograms times metres squared per second. Reports state that with the introduction of the Planck’s constant, the Le Grand K will no longer be a perfect kilogram. In fact, its mass will have a fudge factor of plus or minus 10kgs.

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