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| physical phenomena > event > atomic process > collision > elastic collision | 
| elastic collision comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| collision | atomic process | |
| elastic collision | collision | Particle reactions in which the same particles emerge from the reaction as entered it (e.g. π- p → π- p). In inelastic scattering, where different and/or new particles emerge, energy is used to create new particles. | 
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