About: http://webisa.webdatacommons.org/168657321

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	is a mixture of two kinds of molecules, known as ortho- and para-hydrogen, which differ from one another by the spins of their electrons and nuclei.
http://www.w3.org/ns/prov#wasQuotedFrom	chemistry-reference.com