About: http://webisa.webdatacommons.org/452748119

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 pump tube is filled with a light gas such as helium or hydrogen and pressurized to seven atmospheres. (note) The piston pressurizes the light gas inside the pump tube.
http://www.w3.org/ns/prov#wasQuotedFrom	jaxa.jp