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(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 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.


Referenced by:
Globular Cluster (GC)
Liquid Planet