Atomic Mass Constant
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PHYSICS
Atomic Physics
Atomic Mass Constant
Atomic mass constant defines the mass scale based on carbon-12 atom's precise mass
4 Feb 2026
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Why is the atomic mass constant defined as 1/12 of the mass of a carbon-12 atom?
Because carbon-12 provides a stable and universally accepted reference for atomic mass measurements.
Because carbon-12 is the heaviest naturally occurring isotope.
Because 1/12 of any atom's mass is easier to measure than the whole atom's mass.
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