About: http://webisa.webdatacommons.org/207603289

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	Oxygen, water, and other impurities contained within the gas can thus be removed in advance, and these impurities can consequently be prevented from being introduced inside the apparatus.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au