About: http://webisa.webdatacommons.org/159369873

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The gas is preferably air for economic reasons, but other gases such as nitrogen, carbon dioxide or argon may be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es