About: http://webisa.webdatacommons.org/45869441

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	Laser pulses of less than 20 nanoseconds are presently preferred when the material being measured is a solid, such as glass, which transmits sound at high speeds.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com