About: http://webisa.webdatacommons.org/371443698

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	Since it is most readily available, ambient air is preferred for compression and supply through the air lines; however, natural gas, carbon dioxide, or other gases may also be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com