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===About Rest Mass===
: The [[SI Unit]] of '''rest mass''' is the [[kilogram|kilogram (kg)]].
: '''Rest mass''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction.
: The [[mass]] of [[Subatomic Particle|subatomic particles]] depends up their relative motion. This becomes significant at speeds approaching the [[Speed of Light|speed of light]].
: The '''rest mass''' of a [[Subatomic Particle|particle]] is [[Mass-Energy Equivalence|equivalent]] to its total [[energy]] (when stationary relative to an observer) divided by the [[Speed of Light|speed of light]] squared.