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electronvolt

Also known as electron volt, eV

In physics, an electronvolt (symbol eV), also written as electron-volt and electron volt, is a unit of measurement equivalent to the amount of kinetic energy gained by a single electron accelerating through an electric potential difference of one volt in a vacuum. When used as a unit of energy, the numerical value of 1 eV expressed in unit of joules (symbol J) is equal to the numerical value of the charge of an electron in coulombs (symbol C). Under the 2019 revision of the SI, this sets 1 eV equal to the exact value Historically, the electronvolt was devised as a standard unit of measur

AI overview

An electronvolt (eV) is a unit of energy that measures the kinetic energy gained by a single electron when it accelerates through an electric potential difference of one volt. Physicists use electronvolts as a standard way to describe energy in atomic and subatomic processes, where the more familiar joule would result in impractically small numbers.

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Key facts

Unit.name: electronvolt
Unit.standard: Non-SI accepted unit
Unit.quantity: energy
Unit.symbol: eV
Unit.units1: SI units
Unit.units2: CGS units
Unit.units4: kilowatt-hours
Unit.units5: kilocalories (thermochemical)
Unit.units6: BTUs

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Wikidata facts

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conversion to SI unit: 0.0000000000000000001602176634
unit symbol: eV
Wikidata SPARQL query equivalent: wd:Q83327 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
numeric value: 0.0000000000000000001602176634

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~11 min read

Article

13 sections

Contents

Definition and use
Relation to other physical properties and units
Mass
Momentum
Distance
Temperature
Wavelength
Scattering experiments
Energy comparisons
Molar energy
See also
References
External links

== Definition and use == An electronvolt is the amount of energy gained or lost by a single electron when it moves through an electric potential difference of one volt. Hence, it has a value of one volt, which is , multiplied by the elementary charge Therefore, one electronvolt is equal to