About: http://webisa.webdatacommons.org/295549429

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	gas) but always contains small quantities of other gases, such as nitrogen, carbon dioxide, and hydrogen, and sometimes ethane and carbon
http://www.w3.org/ns/prov#wasQuotedFrom	abovetopsecret.com