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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]
- ↑ "What is rest mass? How to explain it especially to the high school students?". PhysLink. Retrieved 2009-10-06.