About: http://webisa.webdatacommons.org/450309162

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	Air is entirely satisfactory as a source of oxygen, but synthetic mixtures of oxygen and diluent gases, such as nitrogen, carbon dioxide and the like also may be employed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com