pm#absorption_measure
  supertype:  pm#physical_process_attribute_or_quality_or_measure
  subtype:  #absorption_unit  a unit for measuring absorption
     subtype:  #sabin  a unit of acoustic absorption equivalent to the absorption by a square foot of a surface that absorbs all incident sound

1 statement is about an indirect instance of pm#absorption_measure (#absorption_unit): pm#graph1_on_absorption
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