Elementary charge
The elementary charge (symbol: e) is a physical constant equal to the absolute electric charge of a proton or an electron. The 2006 CODATA recommended value is e = 1.602 176 487(40) × 10−19 C.[1]
Measurement
In the most recent CODATA adjustments,[1] the elementary charge is not an independently refined quantity. Instead, a consistent value is derived from the relation e2 = hα/μ0c0, where h is the Planck constant, α is the fine structure constant, μ0 is the magnetic constant and c0 is the speed of light. The uncertainty in the value of e is currently determined entirely by the uncertainty in the Planck constant.[note 1]
Notes and references
Notes
References
- ↑ 1.0 1.1 Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>. Direct link to value.
External links
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