About: http://webisa.webdatacommons.org/202873763

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	Some bulk materials, however, such as sand, have a variable void fraction which depends on how the material is agitated or poured.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org