In atomic, nuclear, and particle physics, physical quantities such as energy, momentum, mass, time, etc. are often expressed in electron-volts (eV). Historically the electron-volt was used as a convenient unit to describe the kinetic energy of subatomic particles accelerated by electrostatic generators. Units in electron-volts continued to be in use to today because of its relevance to fundamental constants such as elementary charge, Plank's constant, speed of light etc. rather than SI base units which are more relevant to our "experiences".
The following are non-rigorous reviews on unit conversions for energy and momentum for novice home experimenters.
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