About: http://webisa.webdatacommons.org/270319943

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	Owing to several factors, such as the refractive index, disc thickness and laser lens aperture, the laser beam's size on the disc surface is approximately 800 ??m.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com