Relation _MASS

Common sense wholes having no compositional structure (Gerstl-Pribbenow96).
Arity: 2
Domain: Material-object
Subrelation-Of: _homogeneous, _weak-whole
Axioms:
(<=> (_Mass ?A ?B)
     (And (_Weak-Whole ?A ?B)
          (_Homogeneous ?A ?B)
          (Material-Object ?A)))