About: http://webisa.webdatacommons.org/119627872

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	For instance, with a material such as silicon and typical laboratory X-rays, the critical angle for total external reflection is usually around a quarter of a degree.
http://www.w3.org/ns/prov#wasQuotedFrom	nanotech-now.com