About: http://webisa.webdatacommons.org/387247521

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	Such materials as polyethylene, polypropylene, polyisobutylene have about the same initial density and the same elemental composition (CH2), only the structures of the initial molecules differ.
http://www.w3.org/ns/prov#wasQuotedFrom	science.gov