How is the mass of a system of non-interacting particles related to the sum of the masses of the particles? Which of these values is greater?

The mass of a system of noninteracting particles with nonzero intrinsic kinetic energy is not equal to the sum of the masses of the particles that make up the system. The mass of a system of non-interacting particles is greater than the sum of the masses of the particles that make up the system.

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