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"Le Grand K," as the platinum-iridium object is known, stood as the world's benchmark of the kilogram for nearly 130 years before a decision was taken in November to bring several units of measurement into the 21st century.Instead of relating to the mass of a singular physical object, the kilogram will now be defined in terms of the Planck constant the ratio of a frequency of light, on the one hand, to the quantum energy of that frequency, on the other.The Planck constant, combined with two quantum phenomena that allow for the creation of electrical power, can be used to calculate mass based on the equivalent mechanical power needed to displace it.
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