What is {density} of {tin} that is {temperature} is {20.0} ?
What is tin's density when the temperature is 20.0?
At a temperature of 20.0, what is the density of tin?
SELECT ?l WHERE { ?s property:temperature ?r . ?s property:density ?l . resource:tin property:density ?s . FILTER ( ?r = 20.0 ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1096> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2054> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P2076> <20.0>
} 

SELECT ?obj WHERE { wd:Q1096 p:P2054 ?s . ?s ps:P2054 ?obj . ?s pq:P2076 ?x filter(contains(?x , '20.0')) }