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In physics, thermalization (in Commonwealth English thermalisation) is the process of physical bodies reaching thermal equilibrium through mutual interaction. In general the natural tendency of a system is towards a state of equipartition of energy or uniform temperature, maximising the system's entropy.

Examples of thermalisation include:

  • the achievement of equilibrium in a plasma.[1]
  • the process undergone by high-energy neutrons as they lose energy by collision with a moderator.[2]


  1. ^ "Collisions and Thermalization". Retrieved 2018-05-14.
  2. ^ "NRC: Glossary -- Thermalization". Retrieved 2018-05-14.