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Proton-to-electron mass ratio
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1836.152673430 +/- 5.51e-7
0.000544617021488 +/- 1.64e-13
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
John D. Barrow, "The Constants of Nature: From Alpha to Omega -- the Numbers That Encode the Deepest Secrets of the Universe", 2003.
Wikipedia: Proton-to-electron mass ratio
Wikipedia: Proton-to-electron mass ratio: Variation over time
Numbers are of type: real number
Sources of data:
Reliability: The given real interval is chosen to contain the measurement up to five measurement uncertainties that are displayed in