Definition of rest mass in English:

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rest mass

noun

Physics
The mass of a body when at rest.
Example sentences
  • 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.

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