About: http://webisa.webdatacommons.org/91052827

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	A critical mass is an amount of fissile material, such as plutonium, containing enough mass to start a neutron chain reaction [Murray, 1989].
http://www.w3.org/ns/prov#wasQuotedFrom	psu.edu