About: http://webisa.webdatacommons.org/178458351

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	The gas which is used to generate the foam can be any gas, although it is preferred to use an inert easily available gas such as air, any other free-oxygen containing gas, nitrogen, natural gas, methane, butane, or carbon dioxide.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com