About: http://webisa.webdatacommons.org/135249159

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	I have heard a lot of different estimates, some as much as 20 feet per second per year (this is an average for the major types of gunpowder).
http://www.w3.org/ns/prov#wasQuotedFrom	survivalistboards.com