About: http://webisa.webdatacommons.org/419832639

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	Media such as air and water exhibit constant propagation speeds, regardless of the frequency.
http://www.w3.org/ns/prov#wasQuotedFrom	h2g2.com