Definition of rest mass in English:
The mass of a body when at rest.
- The concept of the rest mass derives from special relativity.
- The neutrino was known from the start to be an extraordinarily light particle, perhaps massless, since its rest mass could never be detected.
- Any object with a non-zero rest mass (like a dust mote) can never reach light speed.
Definition of rest mass in:
- US English dictionary
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