Equation 3 · Part 4 · The Last Artefact: Redefining the Kilogram
Symbol I_1
What this part means
is an input to the expression that computes the quantity on the left.
Its job in the formula
is an input to the expression that computes the quantity on the left.
Full expression→Symbol I_1→Article meaning
The passage around this formula
The geometric factor Bl appears in both and is eliminated between them: . The BIPM’s mise en pratique is careful about what has just happened: “power of a mechanical nature is equated to power of an electromagnetic nature. The powers are manifestly ‘virtual’ in this method of operation because power does not figure in either mode of this two-mode experiment” [ 4 ] . No power is transferred in either measurement. The equality is between quantities constructed after the fact.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
See this notation across published equations →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.