About: http://webisa.webdatacommons.org/408561601

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	Such a gas might be e.g. helium, neon, argon, xenon or any other gas which is found in trace concentrations (0.01%) in atmospheric air.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com