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WonderQuantum metrology fact1,961 of 1,961

A Kibble balance realizes the kilogram by balancing weight against electromagnetic force measured with quantum electrical standards tied to the fixed value of Planck's constant.

Rebuilding a kilogram from nature

ScienceEngineeringTechnology

Why it matters

The idea in context

The balance works in two linked modes. One matches a mass's weight with magnetic force on a current-carrying coil; the other moves the coil to calibrate the same system through induced voltage. Quantum standards make the electrical measurements traceable to Planck's constant, whose value was fixed in the 2019 SI. A suitably equipped metrology institute can now realize mass from a reproducible recipe instead of comparing everything to one ageing object.

Türkçe

Aynı kart, başka bir dilde.

Kibble terazisi, ağırlığı Planck sabitinin sabitlenmiş değerine bağlı kuantum elektrik standartlarıyla ölçülen elektromanyetik kuvvetle dengeleyerek kilogramı gerçekleştirir.
Kilogramı doğadan yeniden kurmak

Terazi bağlantılı iki kipte çalışır. Birinde kütlenin ağırlığı, akım taşıyan bobindeki manyetik kuvvetle eşleştirilir; diğerinde aynı sistem, bobin hareket ettirilip indüklenen gerilim ölçülerek kalibre edilir. Kuantum standartları elektrik ölçümlerini, değeri 2019'da yürürlüğe giren SI tanımında sabitlenen Planck sabitine bağlar. Yeterli donanıma sahip bir metroloji enstitüsü artık bütün kütleleri yaşlanan tek bir nesneyle karşılaştırmak yerine tekrarlanabilir bir tariften gerçekleştirebilir.

Source trail

Read beyond the card.

Background reading: Kibble balanceAttribution and context are revised when stronger evidence appears. Corrections are welcome through the editorial page.
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