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===About Rest Energy===
: The '''rest energy''' of [[Subatomic Particle|subatomic particles]] is usually quoted in [[Electron-Volt|electron-volts (eV)]] or [[Megaelectron-Volt|megaelectron-volts (MeV)]].: '''Rest energy''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction.
: The '''rest energy''' of a [[Subatomic Particle|subatomic particle]] is released in an [[annihilation]] with its [[antiparticle]].
: The total '''rest energy''' is the product of the [[Rest Mass|rest mass]] and the [[Speed of Light|speed of light]] squared.