About: http://webisa.webdatacommons.org/221503603

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	Conveniently, subatmospheric pressure may be obtained by such means as vacuum pumps, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk