Proton-to-electron mass ratio
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Numbers
$\mu$:
1836.152673430 +/- 5.51e-7
$\mu^{-1}$:
0.000544617021488 +/- 1.64e-13
Definition
The proton-to-electron mass ratio $\mu$ is the quotient of the rest mass of a proton by the rest mass of an electron.
$\mu$ may not be constant [3].