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Concept
Rest Mass
Rest mass
, also known as
invariant mass
, is the
mass of an object
as measured when it is at rest relative to the observer, and it remains constant regardless of the
object's speed
or the
observer's frame of reference
. It is a
fundamental property in physics
, distinguishing it from
relativistic mass
, which increases with velocity according to the
principles of special relativity
.
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