What is the {powder} with the {MAX(emissivity)} ?
Which powder has the greatest emissivity?
select ?ent where { ?ent wdt:P31 wd:Q2908004 . ?ent wdt:P1295 ?obj } ORDER BY DESC(?obj)LIMIT 5 
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q2908004>.
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1295>.
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .}
ORDER BY DESC(?obj)
LIMIT 5
Which powder is most effective at emitting energy as thermal radiation?