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.
For editors and proofreaders
Syllabification: rest mass
Definition of rest mass in:
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.