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 condition of low oxygen; it is typically defined as a level below 20.9% in an atmospheric environment and in the range between 1%-30% saturation in an aquatic environment. Hypoxic conditions are detrimental to living organisms. In a conservation context, hypoxia may be deliberately induced as a means of preservation of materials or pest control. For the extreme condition in which oxygen is below 0.1% or absent, use "anoxia." For a medical condition characterized by low blood oxygen, use "anoxemia," for which "hypoxemia" is a used for term.