What is the {operationalization} for {measured by} of {mass}
What is the mass measuring unit?
What is the unit that measures mass?
SELECT DISTINCT ?j WHERE { resource:mass property:measurement_scale ?j . ?j rdf:type ontology:operationalization }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11423> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1880> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q286017> } 
 select distinct ?obj where { wd:Q11423 wdt:P1880 ?obj . ?obj wdt:P31 wd:Q286017 } 