About: http://webisa.webdatacommons.org/343704651

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	Of course this assumes that the air is a non-compressible fluid, that it flows nicely in a laminar manner down the tube and that there is no friction on the walls of the tube.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com