How we measure the world underwent a quantum leap on Monday as scientists adopted new hyper-accurate definitions for units of weight, electricity, and temperature derived from the universal laws of nature.
“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. “The problem is that it’s had a life, it could fluctuate. That’s not good enough, given the level of precision we need today.”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.Energy is intrinsically linked to mass, as Einstein demonstrated with his equation E=mc squared.
Proponents of this approach say it will be at least one million times more stable than physical artefacts and will have a range of practical applications, from pharmaceutical measurements to scientific research.
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