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==Key Stage 5==
===Meaning===
'''Rest energy''' is the [[energy]] associated with the [[mass]] of a [[Subatomic Particle|particle]] , by the [[Mass-Energy Equivalence|mass-energy equivalence]], which is stationary relative to the observer.
===About Rest Energy===
: 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.
===Equation===
The '''rest energy''' is given by the equation