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The mass m is the degree to which a particle maintains in its movement. It is expressed in grams or in MeV/c2.



If a particle would be at rest, you have the rest mass m0. Near the speed of light, particles have a higher mass. This is called the relativistic mass mv.

Mass and energy bend spacetime, and affect the movement of particles, including light. Usually you write the mass as m if it is clear what mass is involved anyway.


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