Rest mass
body's intrinsic mass (or equivalent intrinsic energy), motion-independent (Lorentz invariant); equals total mass (or energy) when at rest
Rest mass (physics), the mass of something that is not moving. All matter has some rest mass. Energy, such as light or kinetic energy (the energy of a moving object) has no rest mass because it causes no change in spacetime in a frozen time frame. However, energy affects mass while time passes; therefore, it affects spacetime, so it has mass.[1]
References
change- ↑ "What is rest mass? How to explain it especially to the high school students?". PhysLink. Retrieved 2009-10-06.
