Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Conditions and Effects (hierarchy name)
4. [conditions and effects by specific type]
5. [conditions and effects for metals]

Anotations

Scope note:

A common type of casting flaw that includes a group or area of cavities caused by shrinkage or trapped gases. Porosity may vary considerably in dimension and may or may not break through thesurface of the cast object.