elektroncoulombs

The electronvolt, often abbreviated as eV, is a unit of energy commonly used in particle physics, atomic physics, and solid-state physics. It is not an SI unit, but it is widely accepted for use with SI. One electronvolt is the amount of kinetic energy gained by a single electron when it is accelerated from rest through an electric potential difference of one volt. The symbol for electronvolt is eV.

The numerical value of the electronvolt is defined in terms of the SI base units. Specifically, one electronvolt is equal to 1.602176634 × 10^-19 joules. This value is exact. The electronvolt is particularly useful because it is convenient for expressing the energies of subatomic particles and the energy differences in atomic and molecular processes. For instance, the ionization energy of hydrogen is approximately 13.6 eV, and the energy of a photon of visible light is typically on the order of a few electronvolts. Multiples of the electronvolt are also frequently used, such as the kiloelectronvolt (keV), megaelectronvolt (MeV), and gigaelectronvolt (GeV), which are respectively 10^3, 10^6, and 10^9 electronvolts. These units are essential for describing the energies involved in nuclear reactions and particle accelerator experiments.