Equation 4 · Part 2 · The Last Artefact: Redefining the Kilogram
Symbol e
What this part means
e is an input to the expression that computes the quantity on the left.
Its job in the formula
e is an input to the expression that computes the quantity on the left.
Full expression→Symbol e→Article meaning
The passage around this formula
…the international uniformity of electrical measurements and their consistency with the SI” [ 9 ] . The consequence was a parallel electrical unit system, close to the SI but not identical to it [ 3 ] . Fixing h and e together dissolved the parallel system: KJ and RK are now calculated exactly from the defining constants, and the conventional values were retired [ 3 ] . A Kibble balance is therefore not merely an accurate balance. It is a mechanical quantity expressed entirely in quantum-referenced electrical…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
- [4] Mise en pratique for the definition of the kilogram in the SI ↗
- [9] New international electrical reference standards based on the Josephson and quantum Hall effects ↗
- [3] The revision of the SI—the result of three decades of progress in metrology ↗
These citations provide research context; check each source for the exact claim it supports.