Difference between revisions of "Electronvolt"
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| − | The '''electronvolt''' (symbol: '''eV''') is a [[non-SI unit]] of [[energy]]. It is defined as the [[kinetic energy]] gained by an [[electron]] on being accelerated through a [[potential difference]] of one [[volt]]: as such, its value in [[SI unit]]s is determined by the measured value of the [[elementary charge]]. The 2006 [[CODATA]] recommended value is 1 eV = {{nowrap|1.602 176 487(40){{e|−19}} J}}.<ref name="CODATA-e">{{ | + | The '''electronvolt''' (symbol: '''eV''') is a [[non-SI unit]] of [[energy]]. It is defined as the [[kinetic energy]] gained by an [[electron]] on being accelerated through a [[potential difference]] of one [[volt]]: as such, its value in [[SI unit]]s is determined by the measured value of the [[elementary charge]]. The 2006 [[CODATA]] recommended value is 1 eV = {{nowrap|1.602 176 487(40){{e|−19}} J}}.<ref name="CODATA-e">{{CODATA 2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?e}}.</ref> |
In chemistry, it is often useful to express the electronvolt as a [[molar quantity]], whose value in SI units is determined by the measured value of the [[Faraday constant]]. The 2006 CODATA recommended value is 1 eV = {{nowrap|96.485 3399(24) kJ mol<sup>−1</sup>}}. | In chemistry, it is often useful to express the electronvolt as a [[molar quantity]], whose value in SI units is determined by the measured value of the [[Faraday constant]]. The 2006 CODATA recommended value is 1 eV = {{nowrap|96.485 3399(24) kJ mol<sup>−1</sup>}}. | ||
Revision as of 09:36, 15 March 2010
The electronvolt (symbol: eV) is a non-SI unit of energy. It is defined as the kinetic energy gained by an electron on being accelerated through a potential difference of one volt: as such, its value in SI units is determined by the measured value of the elementary charge. The 2006 CODATA recommended value is 1 eV = 1.602 176 487(40) × 10−19 J.[1]
In chemistry, it is often useful to express the electronvolt as a molar quantity, whose value in SI units is determined by the measured value of the Faraday constant. The 2006 CODATA recommended value is 1 eV = 96.485 3399(24) kJ mol−1.
In particle physics, it is also used as a unit of mass.
References
- ↑ 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.
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