<http://webisa.webdatacommons.org/prov/466426591> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/11706713> . <http://webisa.webdatacommons.org/11706713> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/11706713> <http://www.w3.org/ns/prov#value> "After being inflated through a valve, they are much less dense than water because they are composed mainly of air, surrounded by a thin layer of synthetic material." . <http://webisa.webdatacommons.org/11706713> <http://www.w3.org/ns/prov#wasQuotedFrom> <wikipedia.org> .