What is the {unit of density} for {measured physical quantity} of {density}
What is the SI unity of density?
Which unit of measurement measures density as a physical quality?
SELECT DISTINCT ?y WHERE { ?y rdf:type ontology:unit_of_density . ?y property:measured_physical_quantity resource:density }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P111> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q29539> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q10387685> } 
 select distinct ?sbj where { ?sbj wdt:P111 wd:Q29539 . ?sbj wdt:P31 wd:Q10387685 } 
Planck density gram per litre kilogram per cubic metre gram per cubic centimetre milligram per cubic metre gram per cubic metre milligram per litre