Equation 1 · Part 1 · From Origins to Frontier: A History of Scientific Instruments and Metrology
Symbol m
What this part means
the test mass.
Its job in the formula
m is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol m→Article meaning
Where the article explains it
where m is the test mass, g the local gravitational acceleration (independently and precisely measured at the balance’s location), v the coil’s velocity in the moving phase, and U and I the voltage and current measured electrically.
The passage around this formula
…effects (the Josephson effect and the quantum Hall effect), a Kibble balance effectively measures mass in terms of the Planck constant, h. The relationship, in its simplified form, is: . where m is the test mass, g the local gravitational acceleration (independently and precisely measured at the balance’s location), v the coil’s velocity in the moving phase, and U and I the voltage and current measured electrically. Combined with the quantum electrical measurements of U and I in terms of…
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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