About: http://webisa.webdatacommons.org/285715686

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	Measurement of the material in such containers as pressurized cylinders, sealed containers, cryogenic flasks, and opaque vessels is often difficult.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com