About: http://webisa.webdatacommons.org/223990967

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 optical gap is an air space, meaning that it contains atmospheric air or other suitable gas, preferably dry gas, such as nitrogen substantially free of H2 O vapor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com