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The electron-volt (unit of energy)

In particle physics, a unit of energy is commonly used: the electron-volt (eV).

1 eV = 1.6 10-19 Joules

Moreover, particles masses are expressed in a more convenient way thanks to the electron-volt.
The famous equation E = mc2 gives the following relationship:

1 eV/c2 = 1.8 10-36 kg

An electron, for instance, has a mass of 511 keV, that is about 10-30 kg.

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Last update: 26/06/1999 :
Didier Verkindt