The electronvolt (symbol eV) is a unit of
energy. In theoretical physics, where distinctions between mass and energy are not concrete, it is often used also as a unit of mass (AAAS Science journal, 2006). It is the amount of
kinetic energy gained by a single unbound
electron when it passes through an
electrostatic potential difference of one
volt,
in vacuo. In other words, it is equal to one volt (1
volt = 1
joule per
coulomb) times the (unsigned)
charge of a single electron. The one-word spelling is the modern recommendation, although the use of the earlier electron volt still exists.
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A unit of energy equal to 1.60 x 10-19 joule and, though not a fundamental unit, is convenient in sub-atomic measurements. It is the energy gained by an electron in falling through 1 volt.
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