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.

Comments

(1)

$\mu$ may not be constant [3].

References

[1]

John D. Barrow, "The Constants of Nature: From Alpha to Omega -- the Numbers That Encode the Deepest Secrets of the Universe", 2003.

Links

[2]

Wikipedia: Proton-to-electron mass ratio

[3]

Wikipedia: Proton-to-electron mass ratio: Variation over time

Data properties

Entries are of type: real number

Sources of data: [1]

Reliability: The given real interval is chosen to contain the measurement up to five measurement uncertainties that are displayed in [1].

How well the digits are known: measured

How they were obtained:

Not computed: the value comes from experiment, and the interval is chosen to hold the measurements together with their stated uncertainties. See the reliability note for which measurements.