What is {vapor pressure} of {butane} that is {temperature} is {68.0} ?
At a temperature f 68.0, what is the vapor pressure of butane?
What is the vapor pressure of butane when its temperature is at 68.0?
SELECT ?a WHERE { resource:butane property:vapor_pressure ?d . ?d property:vapor_pressure ?a . ?d property:temperature ?w . FILTER ( ?w = 68.0 ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q134192> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2119> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P2076> <68.0>
} 

SELECT ?obj WHERE { wd:Q134192 p:P2119 ?s . ?s ps:P2119 ?obj . ?s pq:P2076 ?x filter(contains(?x , '68.0')) }