About: http://webisa.webdatacommons.org/235500581

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	In use, the pressure differential between the atmosphere and the vacuum chamber V will keep the rest of the seal together, but additional constraints can be provided for when the vacuum is released, e.g. for maintenance.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com