About: http://webisa.webdatacommons.org/95832942

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	Isobutane is a hydrocarbon, and as compared with air, its specific gravity is about 2 times at ordinary temperature and atmospheric pressure (300K, 2.04).
http://www.w3.org/ns/prov#wasQuotedFrom	google.es