query: #Explain identifiers in ideal gas law (wd:Q11432)
  SELECT ?identifier ?descriptionLabel WHERE {
  wd:Q11432 p:P527 ?statement2.
  ?statement2 ps:P527 ?description.
  ?statement2 pq:P2534 ?identifier. 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }