# Electronvolt

"meV", "keV", "MeV", "GeV", "TeV" and "PeV" redirect here.

- Electronvolt

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## Particle accelerator

Machine that uses electromagnetic fields to propel charged particles to very high speeds and energies, and to contain them in well-defined beams.

Machine that uses electromagnetic fields to propel charged particles to very high speeds and energies, and to contain them in well-defined beams.

It is a collider accelerator, which can accelerate two beams of protons to an energy of 6.5 TeV and cause them to collide head-on, creating center-of-mass energies of 13 TeV.

## Elementary charge

Electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant.

Electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. This elementary charge is a fundamental physical constant.

However, the unit of energy electronvolt reminds us that the elementary charge was once called electron.

## Joule

Derived unit of energy in the International System of Units.

Derived unit of energy in the International System of Units.

Zeptojoule: The zeptojoule (zJ) is equal to one sextillionth of one joule. 160 zJ is about one electronvolt. The minimal energy needed to change a bit at around room temperature – approximately 2.75 zJ – is given by the Landauer limit.

## Mass

Quantity of matter in a physical body.

Quantity of matter in a physical body.

the electronvolt (eV), a unit of energy, used to express mass in units of eV/c2 through mass–energy equivalence

## Photoelectric effect

Emission of electrons when electromagnetic radiation, such as light, hits a material.

Emission of electrons when electromagnetic radiation, such as light, hits a material.

Emission of conduction electrons from typical metals requires a few electron-volt (eV) light quanta, corresponding to short-wavelength visible or ultraviolet light.

## Unit of measurement

Definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

Definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

These may include the solar mass (2 kg), the megaton (the energy released by detonating one million tons of trinitrotoluene, TNT) and the electronvolt.

## Plasma (physics)

One of the four fundamental states of matter.

One of the four fundamental states of matter.

Plasma temperature, commonly measured in kelvin or electronvolts, is a measure of the thermal kinetic energy per particle.

## Metric prefix

Unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit.

Unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit.

They are also used with other specialized units used in particular fields (e.g., megaelectronvolt, gigaparsec, millibarn).

## Positron

Antiparticle or the antimatter counterpart of the electron.

Antiparticle or the antimatter counterpart of the electron.

These positrons soon find an electron, undergo annihilation, and produce pairs of 511 keV photons, in a process similar (but much lower intensity) to that which happens during a PET scan nuclear medicine procedure.

## International System of Units

Modern form of the metric system and the world's most widely used system of measurement.

Modern form of the metric system and the world's most widely used system of measurement.

Some common examples of such units are the customary units of time, namely the minute (conversion factor of 60 s/min, since 1 min = 60 s), the hour (3,600 s), and the day (86,400 s); the degree (for measuring plane angles, and the electronvolt (a unit of energy,

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