Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. physicochemical processes

Anotations

Scope note:

The volatilization or evaporation and subsequent condensation of a liquid, as when water is boiled and the steam is condensed, for such purposes as purification, concentration, or separation of substances.