About: http://webisa.webdatacommons.org/150171701

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	Basically, your question is a duplicate of physics.stackexchange.com/q/2095/373 .
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com