About: http://webisa.webdatacommons.org/100217436

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	Gases typically employed include air, nitrogen, carbon dioxide, helium or other generally inert gas, or mixtures thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es