eV

The abbreviate eV stands for electronVolt, and is the favourite unit used by physicists to express quantities of energy and mass.

Usually you will see MeV (Mega electronVolt), GeV (Giga elecronVolt) or TeV (Tera electronVolt).

1 TeV = 1,000 GeV = 1,000,000 MeV = 1,000,000,000,000 eV