Equation 2 · Part 4 · The Last Artefact: Redefining the Kilogram
Symbol B
What this part means
B is an input to the expression that computes the quantity on the left.
Its job in the formula
B is an input to the expression that computes the quantity on the left.
Full expression→Symbol B→Article meaning
The passage around this formula
The Kibble balance runs in two modes. In weighing mode, the weight of an artefact of mass m is balanced by the force on a coil of wire length l carrying current I₁ in a radial field of flux density B. In moving mode, the same coil is driven vertically at velocity v through the same field and the induced voltage U₂ is measured [ 4 ] : . The geometric factor Bl appears in both and is eliminated between them:
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
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