chemodynamics

Chemodynamics is the dynamics of chemical reactions, or the study of that. In astrophysics, applying this term to a model suggests the model includes chemical reactions between some of the modeled material. The term is also used to describe actual reactions in systems such as galaxies or planet systems. Chemical reactions take place at temperatures less than the material's plasma temperature, which generally varies by nucleus size. Much of what is studied in astronomy is too hot, e.g., stars, and much observation is of thermal emission, which is dimmer at lower temperatures, challenging our ability to observe chemical reactions at such a distance.

Among the uses of the term is the evolution of chemistry (metallicity) throughout a galaxy given that of its stars and clouds and the stars' and clouds' dynamics within the galaxy.