Astrophysics (Index)About


(particles escaping, e.g., liquid molecules escaping as gas)

The term evaporation refers to a liquid turning to a gas but also is used in an analogous sense in astrophysics. Evaporation from an atmosphere or cloud means a particle escaping gravity and flying free, either for being in the far end of the particles' velocity distribution (for which a timescale may be devised, e.g., the effectively-short timescale for hydrogen to escape Earth's atmosphere) or through addition of energy, e.g., photoevaporation.

The term evaporation is also used analogously in the study of gravitationally-bound groups of stars (galaxies, globular clusters, open clusters) to indicate a star escaping after acquiring sufficient velocity.

Further reading:

Referenced by pages:
globular cluster (GC)
liquid planet