About: http://webisa.webdatacommons.org/218377591

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 envelope is a large bag containing the lighter-than-air helium gas which provides the airship with much of its lift.
http://www.w3.org/ns/prov#wasQuotedFrom	aerospace-technology.com